You just have to make time.
BTW with only one kid (especially if your wife is planning on staying home with the baby), it's actually pretty easy. It's only *really* become hard to find time now that we have three kids, especially since my 3 1/2 yo is autistic and refuses to be confined to the open garage. I can watch the 5 1/2 yo (and he helps), but that leaves the 3 1/2 yo and the infant with my wife...
My strategy is to try to avoid weekend brewing as much as possible. I'll brew in the evenings after work, as I stay up late anyway, or I'll try to brew when my wife might have some coverage from the in-laws. Alternatively, when I have vacation days piling up at work sometimes I'll just take a day off, tell my wife "pretend I'm at work", and brew. Hell, I've even hired a babysitter once for brewing!
I got 12 batches in last year, and I've already done 3 this year.