Having a baby

A nervous young guy was walking up and down the waiting room at the Maternity hospital, and he looked at a cool, and calm older man, who was reading a magazine.

The younger man said "I guess you have been here a few times".

"Yes" said the older man. The younger wanted to know "How long after the baby is born, before you can have sex with the mother?"

The older guy equitably replied

Spoiler:

"It depends on whether she's in an open ward or a private room".