okay - this has happened twice in as many nights. DS1 is almost 2.5 and the past 2 nights i have found him down stairs after escaping from his bedroom - he has a stairgate on his bedroom door which he can't climb over and the gate was closed so i dont think he opened it and closed it again (it is really stiff). There is a very small gap between bottom of stairgate and floor - do you think he could get through? He is big for his age and looks about 3.5? I am confused?