13 MayPoop, Diapers and Rashes… Oh my! By Dr. Tanya In Dr. Tanya's Tips, Newborns (birth to 3 months)1. What color should my baby’s poop be? You may think that poop should be brown, but babies produce a wide variety of colors! During the first 24 hours of life, it is thick, sticky, and brownish-black in color (meconium). Read MoreShare: