1. Semen from male is discharged in the vagina
2. Sperms will begin moving up to the uterus reaching the fallopian tube
3. During the travel most of the sperms will die while climbing up the fallopian tube, only one sperm will enter the ovum and can remain alive for only 12 hours
4. If it meets ovum which will lead to fertilization
5. This zygote (fertilized egg) will form in an embryo from which will enter gestation period. It is around 9 months in time for the woman to give birth