Has baby had any Vs? Breastmilk is baby’s optimal food, and is much more completely absorbed than formula or other food. It IS possible for an EBF baby to not poop for days at a time as their body does not have waste to pass. Is baby peeing ok? Weight staying on track? You can always weigh baby in a clean diaper before nursing and then weigh right after, to see how much they drank (if there is worry that mom is not producing enough). If there is no issue with production, and baby is happy and hydrated I would say there is nothing to worry about and baby should produce a bowel movement soon.