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 millions sperm.
A single sperm penetrates the egg – conception has occurred.
In the first two weeks, the fertilised egg travels to the uterus, attaches to the uterine wall, and implants itself.
By week four, the embryo is now …
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