How your baby’s tummy works
A baby’s digestive system is like a long conveyor belt. At one end, milk is loaded into the mouth five to eight times a day. It is quickly delivered to the stomach, and then is slowly carried through the intestines, where it is digested and absorbed. Whatever milk isn’t absorbed gets turned into poop and is temporarily stored in the colon.
When the next meal begins, the stomach telegraphs a message to the lower intestines, commanding them to squeeze. The squeezing pushes the poop out, making room for the next load of food. This message from the stomach to the colon is called the gastro-colic reflex.