In the first 24 hours of life, babies pass meconium, a black, sticky stool. As babies start to feed and digest breastmilk or formula, their stools will become runny and yellow or green with a cottage cheese-like consistency. Most babies will have a few bowel movements per day, but some will go a few days without one. This is okay if they are feeding well and have six to eight wet diapers per day.