R.C.
You might do an Internet search to see if there are any products that you can use. My son went through a short period of doing that (he is now 2 but that is around the time he did it) but I think he is almost too big now. In my experience, I like to keep them in the crib as long as I can (within reason). Our two year old is an adventurer...I am not ready for him to have that taste of freedom yet. :) (Thankfully he LOVES his crib)
Good luck!