Sorry Im no use. DD1 was three years old and got sick, had to get rid of it (ulcers in mouth) and DD2 is now 17 months no sign of losing it. I actually would be lost without it, both my girls get/got very easily bored in pram and car so it's a bit of a help. So I will be starting my own thread soon enough on how to get rid of it! I guess I'll just stop giving it to her at all during the day.
for a young one, I know I tried with coco when she was about 6 months. She went two weeks without it, but it was difficult. I just went cold turkey. She was right in a couple of days. I did go back to it though, so again sorry Im not much use xoxo