Pregnancy: Eighteen weeks

At eighteen weeks in your wife’s pregnancy, your baby’s lungs will already have begun forming the alveoli—the tiny air sacs that will help him breathe once he leaves the womb.

 

Until then, even though his vocal chords are developed and he goes through the motions of crying, without air there is no sound.

 

Here is a picture of what your baby looks like at this stage:

See the other pregnancy weeks

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