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What causes hiccups? Beats me. It seems to have something to do with the neurologic control of the diaphragm that somehow gets temporarily confused for whatever reason, since that's what a hiccup is - a sudden spastic contraction of the diaphragm. Since fetuses (yep, in utero) get hiccups (as many mothers can attest) - air has nothing to do with it. The unborn child does "breathe" amniotic fluid in the womb - that is necessary for the lungs to form normally. It seems if you give your newborn with the hiccups a little something to drink, they go away. I can't prove that's why they disappear - it could be coincidence. At any rate, much ado about nothing.