Something else I considered when I was crib shopping is what it's made out of and finished with. Babies spend a lot of time chewing on their cribs, so I wanted one with a nontoxic finish. I also wanted one of all hardwood, as particle board is made with formaldehyde and can release toxic gasses.
You can spend several hundred dollars for a crib made of sustainable hardwood. I didn't have the luxury of a big enough budget to spring for sustainable, but I looked and looked until I found something that was at least hardwood and with a nontoxic finish.
I was lucky enough to find a nice modern baby crib for a good price at Walmart, of all places. So far it is holding up well!