YOU are the parent. it can take longer than 5 days, MUCH much longer. it can take months, if you read that arcticle. (it usually doesnt take months though). like i said, YOU are the parent, and if you want to try it for longer than 5 days, that is up to YOU. the GI is wrong. in fact, many doctors are wrong about reflux and mspi issues. that is why we have so many people on these boards, because they arent getting much help from their doctors! we were told my son didnt even have reflux, and that he was just fussy and i was over feeding him! what a joke! and my doctor had never even heard of neocate, i TOLD her we were going to try it, after i read about it.
i would do the switch very slowly. elecare and necoate are MUCH more awful tasting than alimentum. your baby may flat out refuse it. some babies have to be tube fed bc they refuse to drink it. i would mix one ounce elecare, the rest alimentum. then the next day maybe 2 ounces elecare, the rest alimentum. and so on.
good luck, and listen to your mommy instincts.