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The fetus makes breathing motions about 14 percent of the time, drawing amniotic fluid inside the lungs. The fetal respiratory rate can rise as high as inhale/exhale cycles per minute at 22 to 26 weeks. This rate changes according to maternal carbon dioxide (CO2) levels, strongly suggesting that the respiratory center in the brainstem of the fetus already detects and responds to changes in CO2 levels in the blood.
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