HI SS,
Yes it works! I don't know how old your baby is but I have recommended Florify for youngsters 6months and older. It is in a capsule but it can be opened and used in a bottle. It is a probiotic and prebiotic. You can also go to the Health Store and tell them about the stupid doctor and the antibiotic and they will know what to sell you. Make sure you go to a store that sells pharmaceutical grade supplements and health items. They not only have better quality things but they are usually well educated in knowing, or knowing where to find, the right stuff.
Vitamin Shoppe is fine, Vitamin World is not. Never GNC or anyplace like Walmart or Rite-Aid. If you don't know, ask them. If they don't know, go somewhere else :)
If you don't keep your baby on probiotics, always start him on one when giving an antibiotic. Antibiotics are only for bacterial infections and even most of them will go away on their own. Always QUESTION the use of the antibiotic as well. Doctors are rewarded nicely by the pharmaceutical companies for prescribing their drug of choice. That may be why your subbing doctor chose one over the other...
God bless,
M.