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Conception
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Gender decided
Week 2, physical? -
Embryo requires a supply of oxygen, and nutrients from maternal blood through the placenta
Week 4, social? And physical. -
Neural tube develops into the spinal cord and brain
Week 6, physical -
Joints are developed. May see knees, ankles and wrists.
Week 9. Physical -
Reproductive organs are developing rapidly
Week 12. Physical. -
Lanugo (very fine hair) is starting to grow all over the baby's body
Week 14. Physical? -
Bones are continuing to grow and lengthen
week 15, physical. -
Hair, eyelashes, eyebrows and taste buds are starting to form
Week 16. Physical -
Lungs are inhaling
Week 17, physical. -
Ears can hear
18 weeks. Physical and social -
Protective coating developing on the skin called vernix caseosa to prevent it from pickling in the amniotic fluid
Week 19, physical. -
20 weeks
The skin is thickening and developing layers, including the surface and the dermis, which is a deeper layer, and subcutaneous layer.
