Crib mattresses???

Does anybody have any experience and/or recommendations on crib mattresses? We ordered the Colgate Eco Classica III Dual firmness mattress and I thought it was one of the best (which I think it still might be) but I went back and read some reviews that I must’ve missed when ordering that talk about the material. I guess it’s made of 92% urethane and there are lots of people talking about how dangerous that can be but after looking at others, it turns out that’s what most mattresses are made of. Anyways, I was looking about returning this one and getting the Newton Wovenaire mattress except it’s pretty pricey compared to other mattresses. I don’t know, there are so many mattresses and things that are potentially bad that it all becomes very overwhelming. So any advice at all is much appreciated. Thank you!