I am stipulating a two-parent household (but stipulating both parents work). If your focus is especially fragile (and I've worked with and admire many people form whom that's the case), a sitter makes this even more tenable. And, again, we're talking about WFH; we're not even addressing commute issues.
They lack the ability to metabolize their toddlers demands and the discipline to get into flow. Or maybe it's because their focus is especially fragile.
What would it take for you to not be able to work full time? Personally it was enough that I didn't get to sleep more than 4-5 hours every night, and I don't think a more "robust" focus would have helped in any way.
I am sure there are software development jobs I am not well suited for, and should not take. In fact, I can think of a bunch of them. That doesn't make them impossible jobs; just not good fits for me. Lots of parents handle this problem just fine. If you can't, make other plans, that's fine too.
Our son demanded by wailing or screaming to be held during all waking until at least 12 months, including sleeping for more than 10 minutes alone. I worked from home during this period and I cannot fathom having been at home alone with him and attending any meeting or focusing on a task in a realistically productive way.