What is the weight limit for a changing table?

We have a Simplicity changing table and the owner's manuel does not come with any instructions as to the weight maximum. What is the weight limit with changing tables? When did you stop using a changing table with your baby?|||At the daycare we used it till they moved up to the 2 year old class. I would say 2 1/2. We had some hefty baby's in there. There was one that was about 40 pounds. It didn't buckle.|||I think you are supposed to stop using them when the child can roll over. We never used one.|||I always changed my baby lying on the floor...that way it wouldn't hurt if she rolled off.