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Your baby has been hiccuping every once in a while for several weeks, and now you might actually feel these baby hiccups, which are triggered by the involuntary movements of his diaphragm. (In adults, this is followed by the quick closure of our vocal cords, which is what makes that familiar "hic" sound.) But because your baby's trachea is filled with fluid instead of air, his fetal hiccups don't make a sound. They will make your belly jump though, which is fun to see and feel!
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