Ovulation, An egg cell is released from the ovary, Conception, A sperm cell penetrates the egg to fertilise it. The fertilised egg cell is called a zygote., Implantation, The embryo implants into the uterus lining., 4 weeks, The embryo is 6mm long. The heart and other organs start to form and the heart begins to beat., 20 weeks, The foetus is now 160mm long. It begins kicking and can hear sounds outside the uterus., 40 weeks, The baby is fully developed and ready to be born. It is now around 520mm long.

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