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Week by week: early pregnancy signs in weeks 1 – 4

What’s happening to your baby in weeks 1 – 4

In the early weeks the sperm’s nucleus commingles with the egg, and your baby’s gender is determined. Sperm carrying a Y chromosome generally results in a baby boy, while sperm carrying an X chromosome generally results in a bouncing baby girl.

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During weeks one and two your fertilised egg, otherwise known as a zygote, will divide into multiple cells and starts burrowing into the rich lining of your uterus. Your precious baby is simply a ball of cells that transforms at this point into a blastocyst. The blastocyst consists of an inner cell mass that eventually transforms into the embryo, another cavity that becomes the amniotic sac, and an outer cell body that will become the placenta.

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By about pregnancy week 3 your baby consists of a ball of cells that can fit into the head of a needle. During your pregnancy at 4 weeks, your amniotic cavity is forming and the placenta is starting to form. Your baby’s organs will also start developing.

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