My son is almost 7 weeks old now and we have been formula feeding him since 3 weeks. We are on our third formula now. He started off on the regular enfamil and we switched him to gentlease because he was having tummy issues. He seemed to do really well with that and averaged 2 poopy diapers a day. We switched him to the organic happy baby sensitive formula last Saturday because I had read that enfamil, similac, gerber, parent choice and earths best were being investigated for having lead contamination in their formula. Since we have switched his formula he went to having only one BM and yesterday he didn’t poop at all. He still hasn’t pooped yet.

My question is how long do I wait to switch formulas? Should I be calling my pediatrician?