Everyone digest differently. Someone has a regular bowel movement and goes to the toilet every day, even at the same time. Someone needs to go every other day, some people even twice a day. Babies are no different. Some babies poo after each feeding, some poo once a day, while others go days without a dirty diaper. Breastfed babies may even poo once a week because breast milk can be absorbed almost entirely, leaving little to move through the digestive tract.