I can't beat what trif has suggested, tho I would amend it slightly by taking out the word "baby" and inserting either your expected granddaughter's name or "you."
(But then, I'm one of those people who's always hated it when people refer to a child as "the baby." That habit probably comes from a time when children weren't necessarily expected to survive. But times have changed, and I think every baby deserves to be referred to by name rather than by category. JMHO, of course.)