About 4 days after Wes was crawling he started pulling up. We are in trouble! Mobility is a big deal, but he wants to stand most of all and will work himself over to anything in his reach and pull right up. I'm thrilled with his strength and determination, but man. I got about 10 days of being able to sit him on the floor with toys while I got things done. Now I can't leave him for a second! He is right into trouble... Bill wants to get him a helmet and knee pads... I think he might need them!