A human egg called an Ovum (from the mother) becomes fertilised by a sperm (from the father) to form a zygote. This implants in the mothers uterus/womb to grow into a fetus and then eventually after about 40 weeks the baby is fully grown and ready to be born.
Comments
S&V Rock Forever commented on :
I never knew this.Very interesting
Cathal commented on :
Within 28 days of fertilisation of the egg the heart is formed and beating to transport blood. Amazing organ.