Development of the Fetus
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Development of the Fetus. The Female Reproductive Organs. The Female Reproductive Organs. Conception. The sperm and ovum, or egg, come together in the Fallopian Tube. The cell that is formed is now known as a zygote . The baby will be a zygote until week 2. Fertilization & Conception Video.

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Development of the Fetus

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Development of the Fetus

The Female Reproductive Organs

The Female Reproductive Organs


The sperm and ovum, or egg, come together in the Fallopian Tube. The cell that is formed is now known as a zygote. The baby will be a zygote until week 2.

Fertilization & ConceptionVideo

First MonthWeeks 1-4

  • By the end of the first month, the embryo (baby from week 2-8) is about the size of a sesame seed.

  • The neural tube is developing (brain, spine and nerves).

  • The heart is forming and begins to beat

At 4 Weeks

First Month

Two MonthsWeeks 5-9

  • The embryo is about the size of a grape.

  • The heart has divided into right and left chambers. It is beating twice as fast as your heart.

  • The nose, mouth and ears are forming.

At 9 Weeks

Two Months

Three MonthsWeeks 10-13

  • By now the fetus (name of baby from 8 weeks to birth) is 2 1/2 to 3 inches long.

  • He has begun swallowing and kicking.

  • All vital organs and muscles have formed and are beginning to function.

  • Fingerprints are formed.

At 13 Weeks

Three Months

1st Trimester 0-3 Months Video

Four MonthsWeeks 14-17

  • Your baby is covered with a layer of thick, downy hair called lanugo.

  • His heartbeat can be heard clearly.

  • Can squint, frown, grimace, pee and suck thumb.

  • Forming taste buds.

At 15 Weeks

4 months

Five MonthsWeeks 18-22

  • A protective waxy coating called vernix caseosa begins to form on baby's skin.

  • By the end of this month, your baby will be nearly 11 inches long and weigh almost a pound.

  • The five senses are each forming.

  • Sex can now be determined.

At 20 Weeks

5 Months

Six MonthsWeeks 23-27

  • Eyebrows and eyelids are visible.

  • Your baby's lungs are filled with amniotic fluid, and he has started breathing motions.

  • If you talk or sing, he can hear you.

  • 2 lbs and 12 ½ inches long

At 27 Weeks

6 Months

2nd Trimester4-6 Months Video

Seven MonthsWeeks 28-31

  • By the end of the seventh month, your baby weighs about 3 1/2 pounds and is about 14 inches long.

  • Body is well-formed.

  • Fingernails cover his fingertips.

  • Can see light and has 20/400 vision (can only see objects close to the face.)

At 30 Weeks

7 Months

Eight MonthsWeeks 32-35

  • Your baby is gaining about half a pound per week, and layers of fat are piling on.

  • He has probably turned head-down in preparation for birth.

  • He weighs between 4 and 6 pounds.

8 months

At 34 Weeks

Nine MonthsWeeks 35-40

  • Your baby is a hefty 6 to 9 pounds and measures between 19 and 22 inches.

  • As he becomes more crowded, you may feel him move around less.

At 40 Weeks

3rd Trimester Video7-9 Months Video

Welcome to the World!!



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