Baby chewing on crib

Any recommendations if your little one is chewing on the crib?

Walked in last night to our little guys face covered in paint chips and his mouth... I'm super worried he is going to bite through the wood even and break off wood chips. My husband and I both freaked out and my husband started wrapping the crib in a towel using a durable string. I didn't trust it so ended up just going in and laying him back town until he went to sleep which took an hr

Any recommendations for crib covers?