Just need a Lil help...

betty

My son is 11 weeks old.. he eats 4oz every 2 hours... the Dr said to try 6 Oz maybe he'll go longer with out eating.. but he just spits it up if I go over 4oz.. the the Dr said it's reflux.. then my son gets very fussy so the Dr said it's colic.. any suggestions on what would work to keep my baby full? Or to help with colic or reflux.. I tried the drops, doesn't do much