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Your baby's first poop will be meconium, a tar-like, blackish-green substance that you'll see for a couple of days. After the meconium runs its course, greenish-brown transitional stools follow; by the fourth or fifth day, breastfed babies pass yellowish, seedy poop, while formula-fed infants' stool is denser and ranges in color from yellow to brown-green.
Expect variation in how often your infant has bowel movements. A formula-fed infant may poop three or four times a day, while a breastfed infant may go after every feeding or as infrequently as once a week. --Sharon Anne Waldrop
Originally published in American Baby magazine, November 2007.
The answers from our experts are for educational purposes only. Please always refer to your child's pediatrician and mental health expert for more in-depth advice.