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A member asked:
My newborn spits up mucusy milk and it smells sour?
A doctor has provided 1 answer
Probably normal: Many newborns have difficulty retaining milk due to a poorly functioning sphincter muscle where the esophagus and stomach meet. The stomach normally has mucus and the sour smell comes from the acid and digestive juices in the stomach. Make sure your baby is gaining weight and report to your doctor if he seems to be fussy or severely colicky - the spit up can cause heart burn.
Answered 10/29/2018
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