If the infant is older than eight weeks old it's normal for the eight week old or older infant to go as long as 4 to 5 days without having a bowel movement.
Breastfed babies can even go as long as a week without having a bowel movement as long as they're 2 to 3 months old.
If the baby hasn't gone poop after a week then they're likely constipated. But if it hasn't been a week yet then I wouldn't worry as it's very normal for a baby to not poop that often.