Q. Is it permitted to give infants infant formula that contains chometz or lacks a kosher for Paysach symbol?

A. Horav Shlomo Miller’s Shlit’a opinion is that if it contains chometz it is prohibited to keep it in one’s possession or derive any benefit from it during Pesach. In general, one should always avoid when not essential, feeding non-certified kosher foods even to infants.
If the list of ingredients shows that there are no chometz components in the food, in case of great need one can feed the non-certified kosher L’pesach items to infants during Pesach.
Kitniyos or food that contains legumes would also be permitted in such a case.

Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a