The women will receive an initial Health Literacy Survey (HLS-EU-Q16) via the email account registered on the platform. From this point until birth, no further notifications will be sent.

Subsequently, reminders will be planned via email to obtain information on BF follow-up, avoiding providing any extra information on BF and, where appropriate, referring to the BF support services available in their area, following a standard clinical practice. During pregnancy, the pregnancy programme of the local and national government provides parenting education and breastfeeding workshops, with various manuals published.

Surveys adapted to this group will be sent out at birth, at 15 days, 6 weeks, 3 and 6 months. The variables to be collected are socio-demographic, related to health literacy, obstetric-neonatal, and breastfeeding variables.

From the initial registration in LactApp during the third trimester, women will be able to consult all the information available in the application. The women will receive an initial Health Literacy Survey (HLS-EU-Q16), from this point until birth, no further notifications will be sent. A reminder schedule will be made via email to obtain information on the follow-up of the BF.

LactApp® works as a self-administered questionnaire based on decision trees constructed with questions and answers developed by professional breastfeeding experts, supported by scientific evidence and updated official health recommendations. In addition, the app will remind them of the topics according to the estimated date of birth provided. Surveys adapted to this group will be sent out at birth, at 15 days, 6 weeks, 3 and 6 months. The variables to be collected are socio-demographic, related to health literacy, obstetric-neonatal, and breastfeeding variables.

LactApp® provides personalised answers that can be arrived at through different pathways, which vary according to the profile of the user and the options she selects, allowing data sampling through an Ecological Momentary Assessment.

The app will remind of:

The first month: baby's breastfeeding position, frequency of feeds, number and consistency of stools, general breast care, average weight gain; in mothers who gave some supplementation, advice and support for them to try re-breastfeeding.

From the second to the third month: advice on expressing milk to create a reserve just in case they went back to work or had to be absent from home for a day, instructions on how to handle and preserve milk.

From the fourth to the sixth month: indications to use the stored milk (if it was created) and techniques for administering it to the infant, the importance of maintaining the EBF and the inadvisability of offering other types of milk or food.

Rate of breastfeeding at 6 months postpartum for women who have used the mobile app LactApp compared with women in routine care arm.

Prevalence of breastfeeding at discharge and breastfeeding at 6 months postpartum.

Women's reported causes of breastfeeding cessation, frequency of reported causes o breastfeeding cessation, and the length of breastfeeding up to six months postpartum.