The embryo forms three germ layers (ectoderm, mesoderm, endoderm) that will develop into organs. Light spotting might occur due to implantation. Take folic acid to support growth.
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Week 18 - Hearing Develops
Week 21 - Eyebrows Form
Week 28 - Rapid Weight Gain
Week 17 - Fat Layers Develop
Week 7 - Facial Features Form
Week 1 - Early Pregnancy
Week 11 - Gender Differentiation