Photographer Dave Young was present through the nights of April 23- 26 at London's Chelsea and Westminster hospital, documenting the reactions of new dads minutes after their partners gave birth. The pictures were taken for The Book of Dads, a special Father's Day charity edition of The Book of Everyone. 50% of the proceeds of the book go towards supporting Borne, a U.K. premature birth charity.

Message to his new baby, Ava Grace, "Changed my f***ing world."
Dave Young/Rex Features