Smells like chemicals

I've washed these more times than I can remember, soaked them in vinegar for days (literally), then rewashed them. They still have a chemical smell. I'm not sure what's going on. I had previously purchased some long-sleeve body suites from the same company, which didn't have this smell. I do not like putting something on my baby that smells so strongly of the chemicals used to process the fabric. If I cannot get the smell out, I'll have to donate them to Goodwill and hope that their laundering is more effective than mine. Other than the smell, the quality of the fabric seems good.