"Birth certificate, things like that. William wasn't born in a human hospital..." John hadn't done much research into everything, which he should have, but didn't.

"He'll need them eventually." John wasn't sure how their son would age. Normally? Slowly? Quick?

He kissed William's head again. "Well if Mum opened the portal for Mycroft, she probably knows and is waiting for him to tell her he's finished the visit. I hope."