Hi, My baby is 5 days old and not passing stool since 2 days. Also she is not able to suck her mother's milk. Local doc is not allowing to feed her with Formula milk as according to him it is causing constipation. Can we give cow's milk to her?

I wouldn't. A 5 do may pass a smear every feed or a diaper filler once a week. If it is soft when they go it is not constipation. Formula is a fine substitute for mothers milk if there are problems with BF. It does not cause constipation in most infants & it is not clear that is what is going on. If the kid passes dry rabbit pellets an ounce of prune juice 1-3x/d will loosen things up.