Breast-milk and infant nutrition study

This study examines whether high folic acid intake by breastfeeding mothers affects a special protein in breast milk that helps babies absorb folate (a B vitamin). Folate is essential for healthy development, but researchers want to understand how much of it reaches babies through breast milk and whether taking a lot of folic acid changes how the milk delivers it. You may be eligible if: - You are a breastfeeding mother aged 18 to 42 years - You have a healthy baby born between 37 and 42 weeks of pregnancy - Your baby is between 7 and 9 weeks old - You are exclusively breastfeeding You may NOT be eligible if: - You had a high-risk pregnancy (eclampsia or HELLP syndrome) - You have diabetes, heart disease, kidney disease, inflammatory bowel disease, or celiac disease - You have had gastric bypass surgery - You take certain medications (including valproic acid, methotrexate, metformin, or some antibiotics) Talk to your doctor about whether this trial might be right for you.