As far as I know that would be normal in a baby not yet born. Remember the lungs do not inflate until after the baby is born and takes it's first cries. It's crying that causes the baby to take it's first breaths and for the lungs to start working. The baby doesn't need oxygen to be taken into the lungs; the placenta delivers the oxygen to the baby. When the baby is born through the birth canal, the fluid in the baby, including in the baby's lungs, is expressed out of the baby.
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