Wikipedia actually has something to say about his week! Here it is:
Week 23
Gestational age: 22 weeks old.
Embryonic age: Week nr 21. 20 weeks old.
The fetus reaches a length of 28 cm (11.2 inches). [BBC says 32 cm... I'll go with the BBC!]
The fetus weighs about 725 g (1 lb 10 oz).
Eyebrows and eyelashes are well formed.
All of the eye components are developed.
The fetus has a hand and startle reflex.
Footprints and fingerprints continue forming.
Alveoli (air sacs) are forming in lungs.
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