I'm posting on behalf of my sister in law who has a 2.8 yr old dd who is proving to be difficult to potty train. She will only go in her knickers, she's tried leaving lower half of clothes off, and she just holds it in. She tells us when she needs a wee, but then won't go once on the potty. Lots of tears al round! My poor SIL is getting a bit stressed. Any ideas gratefully received.