Embryo - First Month

After fertilization (four weeks gestational age), your first missed menstrual period happens. The mother’s menstruation is suppressed by chemical signals emitted by the unborn child. The child’s first completed brain cells appear. The embryo’s heart hast started its advanced stage of formation. Their eyes begin to form, and the brain, spinal column, and nervous system are virtually complete. At 3 weeks, the heart begins to beat.

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