Day 1: Fertilization: all human chromosomes are present; unique human life begins. Day 6: Embryo begins implantation in the uterus. Day 22: Heart begins to beat with the child’s own blood, often a different type than the mother’s. Week 3: By the end of the third week the child’s backbone spinal column and nervous system…
Day 1: Fertilization: all human chromosomes are present; unique human life begins.
Day 6: Embryo begins implantation in the uterus.
Day 22: Heart begins to beat with the child’s own blood, often a different type than the mother’s.
Week 3: By the end of the third week the child’s backbone spinal column and nervous system are forming. The liver, kidneys and intestines begin to take shape.
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