Car? What car? You are walking, biking, riding the bus.
It's doable, barely, just barely and there will be troubles if anything comes up.
I doubt it.
But none of those things were specified in OP's post.
I don't disagree. Not a good life.
People live on a buck here and there and change they find in vending machines as far as a "living" goes. Technically they are "alive" but it can't be nice way to live.
Kind of makes one wonder exactly what level of "living" is acceptable. I suppose preferences vary.
Go look at the size of a log cabin, they were about the size of a single bedroom today and large families lived in them.
The amount of money and extra time that we spent on just one baby was astounding - clothes, doctor visits, food. Many more trips to the store/pharmacy/doctor, etc, than normal.
The USDA's child cost estimator [0] says that raising a child in the midwest costs about an extra $12000 a year, on average. Not all of that breakdown may apply, but even if you were to ONLY look at food costs, an extra $1500/year in food (when you're only making the hypothetical $800/month discussed in the GP) is not "a little".