Oh worried mommy, I hope things get better so she doesn't need an op. They are so precious.

Which antibiotic is she on? We use Bactrim but only 1 ml daily and haven't had an issue with constipation. Although my son has only minor reflux he doesn't experience any constipation from that either.

Has your girl started on a new solid lately? Banana or something else introduced can cause constipation, but so can 2.5 mls of medication. If not already you can try natural laxative foods rather than more medication to fix it once the initial constipation is clear. If she is doing solids, maybe 2 fruits in natural juice mushed up or pureed apple etc can be introduced? If really good with solids small pieces of melon (ie watermelon, cantelope/rock melon, honeydew melon etc) can be given for her to chew on. To clear bad constipation sifted/softened/mashed prunes etc can be used - stir into rice cereal. Just a thought.

Let us know how she goes. Best wishes