No more room

Anybody else feel like if their baby stretches any further they might pop out of there? I swear my son does some stretching movements in there that feel like his foot could just pop right out of my tummy. My daughter moved a lot but not as much as he does, he's always kicking, rolling, or stretching in there20/7(I'll say he stops about 4 hours a day). I don't mind all the ruckus but I wonder what he could possibly be doing, it's like he's trying to find a way out already.