Week 19
Gestational age: 18 weeks old.
Embryonic age: Week nr 17. 16 weeks old.
- The fetus reaches a length of 20 cm (8 inches).
- Lanugo covers the entire body.
- Eyebrows and eyelashes appear.
- Nails appear on fingers and toes.
- The fetus is more active with increased muscle development.
- "Quickening" usually occurs (the mother and others can feel the fetus moving).
- The fetal heartbeat can be heard with a stethoscope.
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).
- The fetus weighs about 925g.
- 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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