DD had recently started doing a couple of things which make me wonder whether I should go and buy a potty this weekend in preparation to start potty training. She stops what she's doing and stands still when she's having a wee and when she's doing a poo, she squats down until she's finished and nods her head if you ask if she's doing a poo. She also goes and gets a clean nappy when she's done a wee/poo and lies down to be changed.