lots of reasons:
1. When newborns are born, their bodies are filled with amniotic fluid. Their stomachs are also very tiny. Spitting up repeatedly within the first few days after birth is completely normal as it helps clear out the birth gunk.
2. Newborns and infants have very sensitive and weak digestive systems. It takes months for them to develop enough to digest solid food, longer to build the muscles needed to keep it down, and even longer to learn how to eat.
3. Newborns and infants have a very sensitive gag reflex. This helps them stay alive by rejecting things that get caught in the mouth such as inedible items and solid food that they can’t swallow. Over time, the gag reflex will become less sensitive and move towards the back of the mouth.
4. Newborns and infants can’t burp because the abdominal muscles and esophagus needed to expel gas and only gas aren’t strong enough. If they’re particularly hungry, they’ll swallow a bunch of air along with their milk. This isn’t harmful, but it’s uncomfortable and parents will quickly learn how to help their infant burp. Done improperly — heck, even properly — can result in a bunch of milk coming up along with the air.
Side note, but if a baby spits up a LOT (large amounts or frequently), they may be overfed – this mainly occurs with babies drinking from bottles. And if they are pissed about spitting up, that isn’t normal. They may have reflux, which is often related to a food allergy. Source: couple of friends had babies like this.
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