Halfway through the second trimester soon. The fetus is about 4.5 inches long. Ultrasound might show more details.
Week 13 - Rapid Growth Phase
Week 38 - Organ Maturation
Week 25 - Brain Growth Spurt
Week 35 - Preparation for Birth
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Week 19 - Muscle Development
Week 12 - End of First Trimester
Week 24 - Viability Threshold