Don't know which one it is but it is highly annoying. As I am home with them all day I can cater to their potty times. For some reason I actually have to go outside with LO but he is learning to go outside by himself like Bootsie. I tell them go pee pee or poo poo and LO actually does if he needs to go but should our schedule change it is like they are being asses to us. I suppose I can get out the Xpen again but LO can jump out of that but I will at least know who is messing with us when we are not home.