Some babies born with underdeveloped digestive system which makes them fussy, with lots of pain stemming from excess gas. They usually “grow out of it”, people say. I am wondering what develops there over time?
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Lots of things develop in the digestive tract, just like everywhere else in an infant’s body. As others have mentioned, gut bacteria are introduced and start to grow. Their liver, pancreas and gall bladder all start to work on their own versus being supported by the umbilical cord. Muscles and nerves in their intestines grow and form connections to allow for proper movement of food through the system. Even things like swallowing take significant co ordination of muscles and nerves that have to develop over time.
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