The fetus reaches viability (can survive with medical help if born). Lungs are still maturing. Rest if you feel tired.
Week 21 - Eyebrows Form
Week 25 - Brain Growth Spurt
Week 3 - Germ Layer Formation
Week 32 - Nail Growth
Week 30 - Head Hair Thickens
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Week 8 - Major Organs Develop
Week 12 - End of First Trimester