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First heartbeat at
4 weeks
Four chambered heart at 6-7 weeks
Neural tube closes at
4-6 weeks
Brain hemispheres differentiate at
6 weeks
Brain comprises 1/2 of embryo’s body weight at
8 weeks
Eyes and mouth formed at
7-8 weeks
Limb buds appear at
4 weeks
Cartilaginous skeleton begins to form at
5-6 weeks
Fingers and toes are separated at
7-8 weeks
Movement Begins
6 weeks
Hiccups
7 weeks
Leg movements
7 weeks
Startle response
7 weeks
Hands come together at midline
7 weeks
Rolls over
8 weeks
Head rotation, neck extension, hand to face
8 weeks
When touched: squints, jaw movement, grasping
8 weeks