how are babies made? – Orange Zone

Question: how are babies made?
- Keywords:
  biology,
  human body,
  reproduction
Asked by anon-294988 on 26 May 2021.
- Emma Yhnell answered on 26 May 2021:
  
  Human babies are made when a sperm fertilises and egg. The sperm carries XY chromosomes and it is this that gives the baby its biological sex. Boys have XY chromosomes, whereas girls have XX. Babies (or fetuses) get the X chromosome from the egg and either the X or Y chromosome from the sperm.

Question: how are babies made?