Obviously DS is too young for real potty training as I don't imagine he can control what he is doing yet. But for several weeks now he always indicates when he has filled his nappy - he looks uncomfortable, tugs at it and lies down on the changing mat pointedly. If you say 'shall we change your nappy' he says 'ugh' (yes). Yesterday he also 'asked' me to change his nappy when it wasn't dirty, but was very wet so perhaps he is also aware of weeing. Is there any harm in buying a potty and putting it in the loo? So we could at least start talking about it? He's our first child so doesn't have an elder sibling to copy, but is one of the youngest at his childminder so presumably he sees older toddlers using potties there.