The timeline of the development of a child in the uterus from the embryo stage

By the end of the fourth month, your baby is about 6 inches long and weighs about 4 ounces. Week 22 Lanugo hair covers baby's entire body. Fertilization is still in process. Week 36 - Week 39 The fetus is considered to be full term by the end of the 37th week.

This means that during weeks 1 and 2 of pregnancy, a woman is not yet pregnant. You might notice your feet expanding too, as your joints loosen up in preparation for labor. Your developing baby is called an embryo from the moment of conception to the eighth week of pregnancy.

Fetal Development Timeline

If you look closely, though, you might see your baby move! That early appendage is now completely gone. The lungs continue to get ready to breathe by inhaling amniotic fluid.

Most internal systems are well developed, but the lungs may still be immature. The fetus has a hand and startle reflex at this stage. Baby's facial features become more distinct.

Your baby is now full-sized. For example, the placenta produces human chorionic gonadotropin, which prevents the ovaries from releasing eggs and stimulates the ovaries to produce estrogen and progesterone continuously.

When the sperm penetrates the egg, changes occur in the protein coating around it to prevent other sperm from entering. The start of pregnancy is actually the first day of your last menstrual period. Therefore, a pregnant woman should not be given any live-virus vaccinations or take any drugs during this period unless they are considered essential to protect her health see Drug Use During Pregnancy.

Muscle tissue and bones keep developing, and bones become harder. The size of the brain however, continues to grow without multiplication of neurons. Meanwhile, your growing girth is making you more uncomfortable, with afflictions ranging from heartburn to hemorrhoids.

You might not look pregnant yet, but you probably feel it! Baby's heartbeat can be heard with a stethoscope. Like a peach, his or her body is covered with soft hairs. The lungs continue to mature until near the time of delivery. Blood vessels from the embryo, which pass through the umbilical cord to the placenta, develop in the villi.

Ask your doctor for tips to deal with these issues. The lower airways of the baby's lungs develop. It is produced by cells that form the placenta and is the hormone detected in a pregnancy test.

The mother can feel the baby moving.The fetal development timeline traces the events which occurs during this stage.

This is the main stage when things can go wrong, as the end of the first trimester is a crucial phase where there is further growth and development of vital organs. Use the stage number links to images and information about each specific stage of human development over the first 8 weeks.

The links below give a broad overview of developmental events during each week. The progesterone helps prepare the endometrium (lining of the uterus) for the embryo to implant. On average, fertilization occurs about two weeks after your last menstrual period. When the sperm penetrates the egg, changes occur in the protein coating around it to prevent other sperm from entering.

Introduction. This page is organised to show a week by week timeline of human development features and approximate timing of key events with more detailed information about specific events in different systems.

Timeline human development

For a less detailed timeline see week by week. An embryo is an early stage of development of a multicellular diploid eukaryotic organism. In general, in organisms that reproduce sexually, an embryo develops from a zygote, the single cell resulting from the fertilization of the female egg cell by the male sperm cell.

Gestation is the period of time between conception and birth when a baby grows and develops inside the mother's womb. Because it's impossible to know exactly when conception occurs, gestational age is measured from the first day of the mother's last menstrual cycle to the current date.

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The timeline of the development of a child in the uterus from the embryo stage
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