My favorite of all the Ancient Egyptian deities is Bes.
He began as protector of the pharaoh, but gained popularity when he started to be known as protector of households, but specifically of mothers and children and childbirth.
A common depiction of Bes is where he is pictured protecting a young Horus.
If a baby laughed for no reason, the explanation of the time was that Bes was shaking his rattle, or making funny faces to make them laugh.