This group consisted of children aged 0-3 years with congenital heart disease who were fed orally according to their age and clinical condition. A researcher-developed questionnaire, anthropometric growth measurements (body weight, height, head circumference, and chest circumference), and the Ankara Developmental Screening Inventory (ADSI/AGTE) were administered to the children and their families. Mothers received individualized family-centered nutrition education prepared by the researcher, including breastfeeding, complementary feeding, age-appropriate nutrition, and nutritional requirements after congenital heart surgery. Following the educational intervention, anthropometric measurements were repeated on postoperative day 1, day 7, and day 14 to evaluate growth outcomes. Developmental status was assessed using the Ankara Developmental Screening Inventory.

Arm/Group Description:

This group consisted of children aged 0-3 years with congenital heart disease who received individualized nutrition education in addition to nutritional support, including fortified breast milk, oral nutritional supplements, and/or enteral nutritional support according to their nutritional requirements. A researcher-developed questionnaire, anthropometric growth measurements (body weight, height, head circumference, and chest circumference), and the Ankara Developmental Screening Inventory (ADSI/AGTE) were administered to the children and their families. Mothers received individualized family-centered nutrition education prepared by the researcher. Following the intervention, anthropometric measurements were repeated on postoperative day 1, day 7, and day 14 to evaluate growth outcomes. Developmental status was assessed using the Ankara Developmental Screening Inventory.

There is a training program prepared by the researcher to increase the nutritional knowledge of mothers with children aged 0-3. The definition and importance of nutrition in the session, respectively, adequate and balanced nutrition, insufficient and unbalanced nutrition damages, grouping of nutrients, feeding 0--6 months old baby, feeding premature baby, breastfeeding, situations to be considered while breastfeeding, starting additional foods, 9-12 monthly baby nutrition, 1-3 years old child nutrition and nutritional nutrition support.

In order to determine the physical growth status of the babies, kilograms (in kg) will be measured by the researcher. These measurement results will be given as average Z scores ((kg) type and percentile values. Body weight is measured on an Oncomed electronic scale by removing the clothing and subtracting the dry weight of the ultra-prima brand diaper.

Height (in cm) will be measured by the researcher to determine the physical growth status of the babies. These measurement results will be given as average Z-scores (cm) type and percentile values. For height measurement, a head-foot board (infantometer) with a measuring tape is used.