Anonymous wrote:OP here. DH does more cleaning than me. Some cooking too, and a lot of grocery shopping. I call it babysitting in a tongue-in-cheek manner when either of us has both (or all) of the kids alone. We usually each take one kid or both handle both kids together.
I can't handle 3 kids with a nanny because the nanny will only be there while I'm working. And with 3 kids, someone is likely to wake up in the middle of the night or too early in the morning. I'd be too exhausted to concentrate on work with the interrupted sleep. There would also be more appointments for the household, which mostly falls onto me to organize.
If you're this nervous about your capacity to handle three kids - even with the level of support your DH is proposing - I recommend sticking with two. I also wouldn't be willing to give up my career for an additional kid, but that's me. My three are 12, 10, and 7.5; the challenges with three change over time, but at no point did I doubt my and DH's capacity to handle things. It's perfectly fine to stop while you have plenty of bandwidth.