Anyone ever dealt with fleas?

So a few weeks ago I realized my cat had fleas. So I treated her for it and put her in the basement (yes with food, water, and her litter box) until I could get the upstairs taken care of. My issue is my 9 month old son. I can’t do much with him crawling all over the place because everything has chemicals in it. So I’ve been vacuuming daily and I found a natural flea spray but it’s just not killing everything. I want to bomb the house but everything I’ve read said it’s not safe with children. And I don’t have a ton of money to hire someone to come in. I keep finding them on me and my son and I’m starting to go crazy. Does anyone have any tips?