Mathematician Hannah Fry has explained why more baby boys are born, and why the levels of baby boys born peak immediately after a war or crisis

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newborn baby next to mother

Two photos of happy couple smiling at the camera - in one photo they are holding baby ultrasound photographs

A mother with her arm around her daughter, who is leaning on her shoulder - they�re looking out onto a pond

A pregnant woman decorating a Christmas tree

Couple in bed and smiling at a positive pregnancy test

Newborn twins

Children in nursery singing nursery rhymes

Newborn baby wrapped in a wool blanket wearing a woolen hat

Parent high fiving child

Burger King sign

Mother talking to teenage daughter about sex

Teenage girl holding her phone