Newborns who are totally dependent on breastfed milk don't have to worry too much about constipation. Mother's milk rarely causes constipation, and the body usually absorbs all the nutrients from the milk, so the frequency of pooping is lesser than formula-fed babies. Formula-fed babies poop three to four times a day, depending on the baby to baby. As long as your baby isn't in any discomfort and is passing soft stool, even if two days apart, you shouldn't have any issue with constipation.