In the process of fertilisation ..egg fuses with sperm cells and it is resulted inĀ zygote...after that zygote results in formation of embryo ..embryo is the stage in which some of of the body parts of baby ...and after some time it results in foetus is stage of baby where all the body parts are identifed....and after this birth of baby takes place...
mark as brainliest , if helpful plzzzz