Linear growth of children is assessed in centimeters of height.

Child development is assessed with the Caregiver Reported Early Childhood Development Instrument (CREDI). The CREDI is a population-level measure of early childhood development (ECD) for children from 0-3 years of age. The CREDI assesses 4 domains of child development: 1) motor (fine and gross motor), 2) language (expressive and receptive language), 3) cognitive (executive function, problem solving and reasoning, and pre-academic knowledge), and 4) social-emotional (emotional and behavioral self-regulation, emotional knowledge, and social competence). The CREDI long form consists of up to 108 items and the number of questions answered depends on the age of the child. Responses of "yes" are coded as 1 and "no" is coded as 0; certain items are reverse coded. Both domain-specific and overall z-scores are calculated. Total raw scores increase by age (with developmental progression), and higher scores indicate increased development.

The MDAT measures gross motor (39 items), fine motor (42 items), language/cognition (40 items) and social skills (36 items). Originally developed and validated in rural Malawi, it has now been used in over 25 countries with more than 8,000 children as both a clinical and research tool. The MDAT is a continuous test with start and stop rules. Most items are administered directly to the child and items that are not easily observed (e.g., child speaks in full sentences; child understands sharing with others; child can dress self) are administered by parent report. Children receive either a pass or fail for each item, and summed pass scores can produce a composite score as well as domain-specific scores. Total scores range from 0 to 157 where higher scores indicate greater neurodevelopment.

Blood pressure is assessed in the pregnant women in the intervention and control arms using automatic sphygmomanometers (OMRON HEM-907XL; Osaka, Japan). The study team will use the procedures adapted from previously validated methods and cardiovascular outcome studies, following recommendations for the American Heart Association and the European Society of Hypertension.

Blood pressure is assessed in the new mothers in the intervention and control arms using automatic sphygmomanometers (OMRON HEM-907XL; Osaka, Japan). The study team will use the procedures adapted from previously validated methods and cardiovascular outcome studies, following recommendations for the American Heart Association and the European Society of Hypertension.

Blood pressure is assessed in the new mothers in the intervention and control arms using automatic sphygmomanometers (OMRON HEM-907XL; Osaka, Japan). The study team will use the procedures adapted from previously validated methods and cardiovascular outcome studies, following recommendations for the American Heart Association and the European Society of Hypertension.

Diastolic blood pressure is assessed in the older adult women in the intervention and control arms using automatic sphygmomanometers (Omron HEM-907XL; Osaka, Japan). The study team uses the procedures adapted from previously validated methods and cardiovascular outcome studies, following recommendations for the American Heart Association and the European Society of Hypertension.

Mean arterial pressure is assessed in the older adult women in the intervention and control arms using automatic sphygmomanometers (Omron HEM-907XL; Osaka, Japan). Mean arterial pressure is calculated as DBP+(SBP-DBP)/3, where SBP=systolic blood pressure and DBP=diastolic blood pressure.

Pulse pressure is assessed in the older adult women in the intervention and control arms using automatic sphygmomanometers (Omron HEM-907XL; Osaka, Japan). pressure. Pulse pressure is the difference between systolic blood pressure and diastolic blood pressure.

Pregnant women have ultrasounds at Baseline and during gestation weeks 24-28 and gestation weeks 32-36 to measure fetal growth outcomes. Specifically, the researchers evaluate head circumference (HC), abdominal circumference (AC), femur length (FL) and estimated fetal weight (EFW) during gestation. The researchers are comparing (i) z-scores of individual fetal growth measurements (HC, AC, FL, EFW) at the 2 growth ultrasound visits between intervention and control participants (separately at 24-28 weeks gestation and 32-36 weeks gestation); (ii) differences in proportions of the 2.5th percentiles of each of these measurements evaluated separately at 24-28 and 32-36 weeks gestation; (iii) Z-score trajectories of HC, AC, FL and EFW as a function of gestational age and intervention; and (iv) prevalence of small for gestational age (SGA) during the fetal period through birth as measured by WHO INTERGROWTH 21st standards.

Gestational age at birth is measured in weeks, as continuous outcome, among all live births.

Preterm birth is defined as delivery of a living infant prior to 37 completed weeks of gestation.

Cumulative incidence of WHO non-severe pneumonia (2014 definition and 2013 definition) during the first year of life. Cases of pneumonia are recorded whenever children present to HAPIN health facilities with respiratory symptoms.

Cumulative incidence of WHO non-severe pneumonia (2014 definition and 2013 definition) during the first year of life. Cases of pneumonia are recorded whenever children present to HAPIN health facilities with respiratory symptoms.

Cumulative incidence of hospitalizations for a respiratory illness during the first year of life.

Cumulative incidence of WHO non-severe pneumonia during the first year of life, as defined in the second edition of the "Pocket book of hospital care for children" (2013). Cases of pneumonia are recorded whenever children present to HAPIN health facilities with respiratory symptoms.

Cumulative incidence of WHO severe pneumonia during the first year of life, as defined in the second edition of the "Pocket book of hospital care for children" (2013). Cases of pneumonia are recorded whenever children present to HAPIN health facilities with respiratory symptoms.

Cumulative incidence of hypoxemic pneumonia during the first year of life. Cases of pneumonia are recorded whenever children present to HAPIN health facilities with respiratory symptoms.

Cumulative incidence of lung ultrasound or chest radiograph pneumonia during the first year of life. Cases of pneumonia are recorded whenever children present to HAPIN health facilities with respiratory symptoms.

Brachial artery reactivity testing (BART) measures endothelial function via flow-mediated dilatation to reactive hyperemia following the release of arm blood-flow occlusion. In this test, baseline artery diameter is measured, then a blood pressure cuff is inflated to induce distal arm ischemia for 5 minutes and after releasing the pressure, the post-occlusion brachial artery diameter is measured. The ratio of post- to pre-occlusion artery diameter represents endothelial function where lower values indicate worse endothelial function. (Peru only)

The carotid intima-media thickness test (CIMT) is used to determine the extent of carotid atherosclerotic vascular disease. The test measures the thickness of the inner two layers of the carotid artery and can detect plaque build up prior to physical symptoms being experienced. The carotid ultrasound will be performed with a portable ultrasound by trained sonographers.

Adult respiratory health and well-being is assessed with the St. George Respiratory Questionnaire (SGRQ). The SGRQ measures impaired health and perceived well-being among individuals with chronic airway disease. The SGRQ has sections assessing symptoms, activities that cause breathlessness or are limited because of breathlessness, and the impacts of respiratory problems on employment, sense of control of health, panic, stigmatization, medication use, side effects of therapies, expectations for health and disturbances of daily life. The questionnaire includes multiple choice, true/false and open-ended questions.

The Short Form 36 survey (SF-36) is a standardized, preference-based 36 item questionnaire evaluating quality of life. The survey has 8 sections (vitality, physical functioning, bodily pain, general health perceptions, physical role functioning, emotional role functioning, social role functioning, and mental health). Possible scores range from 0 (lowest quality of life) to 100 (highest quality of life).

Weight is measured in kilograms (kg). Weight in new mothers in Rwanda is measured when the child is 24 months old. For new mothers in Guatemala weight is measured when the child is 24 and 36 months old. In older adult women, weight is measured when the child is 24 months old. Weight is measured in children at 24, 36, 48 and 60 months of age.

BMI is calculated as weight in kilograms divided by height in meters (m) squared (kg/m^2). BMI in new mothers in Rwanda is calculated from height and weight measurements obtained when the child is 24 months old. For new mothers in Guatemala BMI is calculated from height and weight measurements obtained when the child is 24 and 36 months old. In older adult women, BMI is calculated from height and weight measurements obtained when the child is 24 months old.

Height is measured in meters. Height in new mothers in Rwanda is measured when the child is 24 months old. For new mothers in Guatemala height is measured when the child is 24 and 36 months old. In older adult women, height is measured when the child is 24-months old.

Blood pressure is assessed in the children using automatic sphygmomanometers (OMRON HEM-907XL; Osaka, Japan). The study team uses the procedures adapted from previously validated methods and cardiovascular outcome studies, following recommendations for the American Heart Association and the European Society of Hypertension.

Linear growth of children is assessed in centimeters at birth and quarterly thereafter, until the child is 12 months old.

Child development is assessed with the Caregiver Reported Early Childhood Development Instrument (CREDI). The CREDI is a population-level measure of early childhood development (ECD) for children from 0-3 years of age. The CREDI assesses 4 domains of child development: 1) motor (fine and gross motor), 2) language (expressive and receptive language), 3) cognitive (executive function, problem solving and reasoning, and pre-academic knowledge), and 4) social-emotional (emotional and behavioral self-regulation, emotional knowledge, and social competence). The CREDI long form consists of up to 108 items and the number of questions answered depends on the age of the child. Responses of "yes" are coded as 1 and "no" is coded as 0; certain items are reverse coded. Both domain-specific and overall z-scores are calculated. Total raw scores increase by age (with developmental progression), and higher scores indicate increased development.

Personal monitoring equipment is used to assess exposure to carbon monoxide (CO) over a 24-hour period in intervention and control participants (pregnant women, older adult women, and children). Exposure for pregnant women is measured at baseline, 24-28 weeks gestation, 32-36 weeks gestation, and in Guatemala and India, when the child is 24 months old. Exposure for the child is measured at 3, 6, 12, 24, 36, 48 and 60 months of age. Exposure for the older adult women is measured at baseline, 3, 6, 12 and 18 months post-randomization, and in Guatemala and India, when the child is 24 months old.

Personal monitoring equipment is used to assess exposure to black carbon (BC) over a 24-hour period in intervention and control participants (pregnant women, older adult women, and children). Exposure for pregnant women is measured at baseline, 24-28 weeks gestation, 32-36 weeks gestation, and in Guatemala and India, when the child is 24 months old. Exposure for the child is measured at 3, 6, 12, 24, 36, 48 and 60 months of age. Exposure for the older adult women is measured at baseline, 3, 6, 12 and 18 months post-randomization, and in Guatemala and India, when the child is 24 months old.

The 10-item Cohen's Perceived Stress Scale (PPS) assesses the way an individual appraises their life events as stressful (e.g., "In the last month, how often have you felt difficulties were piling up so high that you could not overcome them?") (Cohen, 1983). Likert-level responses ranged from 0 (never) to 4 (very often), meaning a high PPS score would result in a high level of perceived stress. A Spanish language PPS created and tested and found to be valid and reliable (Vallijo et al., 2018).

Fetal death before 19 weeks 6 days.

Births at less than 34 weeks completed gestation, among all live births.

Including preterm birth and stillbirth.

Any fetal deaths occurring at or after 20 weeks' gestation OR indicated on Serious Adverse Event form OR on Pregnant Woman Medical History form OR on verbal autopsy form.

Death between birth and 28 days.

Two buccal cell scrapes will be collected by gently scraping the buccal mucosa on both sides of the mouth with a small plastic collection spoon. Nasal turbinate brush samples can be collected using a soft cytobrush on each turbinate. Collection is gentle and causes no discomfort to study participants. Both samples will be processed in the laboratory according to procedures detailed in the protocol. This will occur in the older adult women in an NCI substudy.

For the oral rinse, participants will vigorously rinse their mouth and the rinsates are collected in a centrifuge tube. The tube is centrifuged and the pellet and supernatant are removed to separate cryovials, labeled and frozen. This will occur in the older adult women in an NCI substudy.

Two buccal cell scrapes will be collected by gently scraping the buccal mucosa on both sides of the mouth with a small plastic collection spoon. A 5-mL venous blood sample will be collected in an ethylenediaminetetraacetic acid (EDTA) vacutainer tube by standard clinical venipuncture of a cubital vein. Both samples will be transported and processed in the laboratory according to procedures detailed in the protocol. This will occur in the older adult women in an NCI substudy.

A 5-mL venous blood sample will be collected in an EDTA vacutainer tube by standard clinical venipuncture of a cubital vein. The sample will be transported and processed in the laboratory according to procedures detailed in the protocol. This will occur in the older adult women in an NCI substudy.

Household food insecurity will be measured using the Food Insecurity Experience Scale (FIES), developed and validated by the Food and Agriculture Organization (FAO). The FIES module includes eight questions, each with yes/no response options, on the household's access to adequate food, and is intended to measure three domains of food insecurity: uncertainty/anxiety, food quantity, and food quality. Each question takes values of 0/1, which are summed for a possible total score of 0-8.

Dietary diversity for women will be measured using the Minimum Dietary Diversity - Women (MDD-W) questionnaire from the FAO and FHI 360, which uses an open recall format to collect data on foods and beverages consumed by the respondent during the previous day and night. Responses will be categorized into ten food groups and women who report consuming five or more out of ten food groups will be categorized as achieving minimum dietary diversity.

Minimum dietary diversity for children will be measured using the World Health Organization (WHO) infant and young child feeding questionnaire. The questionnaire uses a combination of open and closed recall and asks caregivers to report on foods and beverages consumed by the infant or young child during the previous day and night. Responses will be categorized into eight food groups and infants who consumed five or more out of ten eight food groups will be categorized as achieving minimum dietary diversity.

Hb will be measured from a single drop of capillary blood obtained via finger prick, using the HemoCue® Hb 201system (HemoCue® AB) point-of-care device

Hb will be measured from a single drop of capillary blood obtained via finger prick, using the HemoCue® Hb 201system (HemoCue® AB) point-of-care device

Lung function measurements will be made using the forced oscillation technique (FOT) with the Tremoflo C-100 device with disposable mouthpieces. FOT is a technique that can identify early changes in the airways. The FOT device measures the relationship between externally applied pressure waves and the resulting air flow to measure respiratory impedance. Values produced at high frequencies correspond to the proximal and large airways, and values produced at low frequencies correspond to distal and small airways. This measurement will be conducted in children in Guatemala.

The carotid intima-media thickness test (CIMT) is used to determine the extent of carotid atherosclerotic vascular disease. The test measures the thickness of the inner two layers of the carotid artery and can detect plaque build up prior to physical symptoms being experienced. The carotid ultrasound will be performed with a portable ultrasound by trained sonographers. This outcome is only assessed in Guatemala during the extended follow-up period (after the birth of the household child).

Multiple exposure biomarkers will be measured: 3-OH Cotinine, 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol (NNAL), levoglucosan, 8OH-deoxyguanosine (8OHdG), and Volatile Organic Chemicals (VOC) metabolites. Exposure biomarkers (especially for children whose urine may be limited) will be prioritized as follows: polycyclic aromatic hydrocarbon (PAH) biomarkers, levoglucosan, volatile organic chemicals (VOC) biomarkers, heavy metals, and tobacco-related biomarkers. Urinary biomarkers will be measured in pregnant women at baseline, 24-28 weeks gestation, and 32-36 weeks gestation, and in new mothers when the child is 24-months old. Biomarkers will be measured in older adult women at baseline, 3, 6, 9, 12 and 18 months post-randomization. Biomarkers will be measured in children at 3, 6, 12 and 24 months of age.

The main biomarkers to be measured from the dried blood spots is: inflammation markers, endothelial markers of cardiovascular disease, oxidative stress markers, Hb, HbA1C, tumor-associated antigen antibodies, cytochrome P450, p53 tumor-associated antigen (TAA), lipids, metabolomics, MiRNA, heavy metals. DBS biomarkers will be measured in pregnant women at baseline, 24-28 weeks gestation, and 32-36 weeks gestation, and in new mothers when the child is 24-months old. DBS biomarkers will be measured in older adult women at baseline, 3, 6, 9, 12 and 18 months post-randomization. DBS biomarkers will be measured in children at 3, 6, 12 and 24 months of age.

Reported diarrhea will be extracted from the Monthly Child Health Status Visit case report form. Each month, the child's caretaker will be administered a survey to obtain information on whether the child under 1 year of age (the HAPIN study index child) or any other child in the home under 5 has experienced WHO-defined diarrhea (defined as three or more loose stools that can take the shape of a container within a 24-hour period) in the past 7 days. Persistent diarrhea will be defined as 14 or more continuous days of diarrhea. The presence of blood in the stool will also be noted as an indicator of severity.