what happens during the third week of pregnancy?

Answer 1

It gets bigger and bigger....

Answer 2

Week 1: Getting ready

It may seem strange, but you're not actually pregnant the first week or two of the time allotted to your pregnancy. Yes, you read that correctly!

Conception typically occurs about two weeks after your period begins. To calculate your due date, your health care provider will count ahead 40 weeks from the start of your last period. This means your period is counted as part of your pregnancy — even though you weren't pregnant at the time.


Week 2: Fertilization

The sperm and egg unite in the fallopian tube to form a one-celled entity called a zygote. If more than one egg is released and fertilized, you may have multiple zygotes.

The zygote has 46 chromosomes — 23 from you and 23 from your partner. These chromosomes contain genetic material that will determine your baby's sex and traits such as eye color, hair color, height, facial features and — at least to some extent — intelligence and personality.

Soon after fertilization, the zygote will travel down one of your fallopian tubes toward the uterus. At the same time, it will begin dividing rapidly to form a cluster of cells resembling a tiny raspberry. The inner group of cells will become the embryo. The outer group of cells will become the membranes that nourish and protect it.


Week 3: Implantation

The zygote — by this time made up of about 500 cells — is now known as a blastocyst. When it reaches your uterus, the blastocyst will burrow into the uterine wall for nourishment. The placenta, which will nourish your baby throughout the pregnancy, also begins to form.

By the end of this week, you may be celebrating a positive pregnancy test.


Week 4: The embryonic period begins

The fourth week marks the beginning of the embryonic period, when the baby's brain, spinal cord, heart and other organs begin to form. Your baby is now 1/25 of an inch long.

The embryo is now made of three layers. The top layer — the ectoderm — will give rise to a groove along the midline of your baby's body. This will become the neural tube, where your baby's brain, spinal cord, spinal nerves and backbone will develop.

Your baby's heart and a primitive circulatory system will form in the middle layer of cells — the mesoderm. This layer of cells will also serve as the foundation for your baby's bones, muscles, kidneys and much of the reproductive system.

The inner layer of cells — the endoderm — will become a simple tube lined with mucous membranes. Your baby's lungs, intestines and bladder will develop here.

Answer 3

R u a woman? U seem not 2 know anything about d 'birds n bees'....During d third week, d feotus is slowly n surely taking shape...

Answer 4

there is a book called "What to Expect When You Are Expecting"
it's a very informative book regarding fetal development, symptoms you may or may not be experiencing, suggestions to help with some discomfort & below is a link to their website
http://www.whattoexpect.com
Good Luck, God Bless

Answer 5

the young one gets the shape after 3 months ok best of luck

Answer 6

Your freaking out thinking you have now 33 weeks to go!

Answer 7

The cells that form the medulla oblongata form.

Answer 8

the child in the woomb becomes little big & gets the shape

Answer 9

go to a web site called http://www.kidshealth.org/parent/pregnancy_calendar

Answer 10

nothing yet

Answer 11

nothing