We're on the toilet training train again lol

TT, 19-20 months isn't an uncommon age for girls to start, I've heard they train a lot earlier and a lot easier than boys, not sure if that's true though?

DS2 wil use the potty fairly well throughout the day, he needs reminding to use it and I ask him to go for a wee every half hour or so. Probably every second time he actually does one.

Poo's on the potty is a different story though. He is yet to make it to the potty, I'm not quite sure what to do about this. He knows that poos are supposed to go in the toilet / potty. He knows it's "naughty" to do them in his undies (we don't tell him off for it, more so just re-iterate that poo's go in the potty and not in his undies). I don't know whether he's just lazy with regard to the number two's or he's not making it there in time when he feels the urge.