Most kids spend at least part of their childhood sleeping in a crib. While cribs are generally safe, there have been some terrible accidents involving crips that could have been avoided. First, you should make sure that you have a good quality crib. Sometimes there will be recalls on cribs because of some defect in their manufacture, so you should pay attention to those. If you can register your crib online, you should get such notices sent directly to your email.
You should also check that the crib isn’t missing parts, such as screws, bolts or similar things that could make it unstable. There shouldn’t be openings where your child could get its head stuck.
If you have blankets in the crib, they could be a danger as well, since your child could get tangled up in them and suffocate. If you are looking for an alternative to a blanket, you could use a wearable blanket or a sleep sack.