See what's happening during different stages of pregnancy, as the baby changes from conception to birth.
- Conception occurs when a single sperm penetrates an egg.
- A human pregnancy usually lasts for 40 weeks.
- By week 18 of a pregnancy it is possible to determine the sex of the baby.
- By week 33 of a pregnancy the baby should settle in a head-down position ready for birth.
An egg travels down the fallopian tube to be met by up to 600 million sperm.
A single sperm penetrates the egg - conception has occurred.
In the first two weeks the fertilized egg travels to the uterus, attaches to the uterine wall, and implants itself.
By week four the embryo is now ...
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