The play pen was a necessity- They are not at all happy with my decision to contain them in one area, however one of them got out of the bathroom and got under Jakes feet. I am thankful to Jake that he didnt bite the baby, but he did growl, which is what alerted me to the fact that there was a problem. You would be surprised at how quick these guys are when they first start walking. Then they got introduced to real food. What a mess. Food was every where, but they have pretty much all decided that it was some pretty good stuff.