what can cause a 3 month old baby to have diarrhea?
["A change in your baby's diet or a change in the mother's diet if breastfeeding.", 'Use of antibiotics by the baby, or use by the mother if breastfeeding.', 'A bacterial infection. Your baby will need to take antibiotics to get better.', 'A parasite infection. ... ', 'Rare diseases such as cystic fibrosis.']