Your Baby's Development at Week 3
Although you don’t know it yet, you might have conceived already! Fertilisation occurs when an egg and sperm connect and form a single cell, called a zygote.
In pregnancy week 3, this is what happens:
- The microscopic-sized zygote divides again and again, growing at an astounding pace in your belly.
- At this stage, your baby already has all of the genetic material she needs for life — half of the 23 pairs of chromosomes from you and half from your partner.
- Your baby’s sex has been determined.
What you need to know about the zygote
Approximately 12 hours after fertilisation, your baby — right now only a one-celled zygote — divides into two identical cells. These two cells each split, creating four cells, which then split to become eight. This continues as the total number of cells in your baby doubles every 12 hours.
If a single zygote splits into two identical zygotes, each with the same genetic makeup, identical twins occur.
During your third week of pregnancy, your zygote is moving down the Fallopian tube to your uterus.
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