My baby is one month old (BF only) and has been having stomach problems starting two days after I began a course of antibiotics (Keflex) for a bout of mastitis. She started spitting up a lot/vomiting, she grunts a lot, strains a lot and cries, and has a lot of gas. She's generally been a happy baby up until this point, and she seems like she's in a lot of pain when she's crying. Her pediatrician said it may be due to my antibiotics, and that it should resolve about two days after I finish my course (the two days are up tomorrow). She said I could try to give her chammomile tea to soothe her belly, but my baby hates it and won't take it.
Has anyone heard of antibiotics causing stomach problems in a nursing child?