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Period of the Zygote
The baby is the size of a pinhead and the uterine lining provides nourishment and zygote grows by cell division -
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The First Trimester
The first trimester is from fertilization all the way to 13 weeks. -
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Period of the Embryo
The baby is about 1 inch long, the umbilical cord extends and connects to the placenta, the ears, nose, and mouth start to develop as well as the arms, legs, hands, and feet -
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Period of the Fetus
The baby is full grown, weighing anywhere from 6 to 9 pounds. Body, head, arms, and legs grow. The organs develop as well as the nerves and muscles. The heart and brain continue to grow -
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The Second Trimester
The second trimester is from 14 weeks to 27 weeks. -
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Sex Detection
The sex of the baby is revealed during the second trimester. Around 16 weeks is when a baby's sex can be determined. -
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Week of Viable birth
The baby can be born prematurely around weeks 21 to 22 or any time after and have a chance of surviving out of the womb -
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The Third Trimester
The third trimester is from week 28 to week 40 -
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Full Term Pregnancy
At week 39 the pregnancy is considered full term