Can These Fumes Harm My Child?

We had an oil based low voc polyurethane applied to our hardwood floors on the entire first floor of our house. Unfortunately I wasn't aware of the toxicity until after it was done and still smelled for weeks and I started researching.  We have a young child and was running air purifiers but after 6 weeks and a lot of research on that and the carpets we had installed in the other room at the same time we decided to remove all the hardwoods and put tile down.