Information regarding your newborn's pooping

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The first time your baby poops, you'll be confronted with something that looks like sticky, greenish-black tar. Called meconium, it's a mixture of amniotic fluid, bile, and secretions from the intestinal glands. Meconium doesn't smell bad, but it's much harder to clean up than regular poop. You can actually apply a layer of petroleum jelly to your baby's skin to act as a barrier.

Within two to four days of birth, your baby will start having transitional poops—a mixture of meconium and breastfeeding (or formula) stools. They're dark green or brown in color, and they have a sticky consistency (although they're softer than meconium). Transitional poops stick around until your baby is eating well.

By the end of the first week, healthy babies digest food in the usual way. Baby poop is then made up of bile from the liver, which is added to food when it leaves the stomach, along with bacteria and undigested components of milk. If you're breastfeeding, your baby's poop will be bright yellow, watery, sometimes seedy, and lightly yeasty-smelling. It may remind parents of mustard, cottage cheese, or scrambled eggs. 

 If your baby drinks formula, their poop will become yellow-brown, green-tan, or brown in their first or second week. This poop is thick and firm, similar to peanut butter or toothpaste. It might have a yeasty aroma from the fermentation of sugars in formula, similar to the process that makes bread rise. Newborns who get a combination of breast milk and formula also produce brown or dark yellow baby poop. 

 When your baby starts eating solid food, a range of healthy bacteria populates their intestines, producing browner and smellier poop. Depending on what your baby ate, it can also be red, orange, green, yellow, or blue. These bowel movements may reveal undigested food chunks, and they tend to be very smelly. 

 Diarrhea can manifest as yellow, brown, or green baby poop with a loose, watery consistency. It can be caused by food intolerances, antibiotics, and less commonly, viral infections or parasites. Babies with diarrhea are at risk of dehydration, so make sure to monitor them closely.

Also note that mucus in baby poop might resemble diarrhea, and it can also have a yellow, green, or brown color. Mucus occurs in bowel movements from a milk allergy, infection, or excessive swallowing of saliva from teething.

 Backed-up infants tend to make dark brown or black baby poop. Constipation is thick and hard, and it resembles small pellets, marbles, or logs. It can happen when fluids and fiber aren't absorbed properly—sometimes from a milk-protein allergy or food intolerance.