I kept my daughter in pull-ups until about 4 1/2 for night time sleeping. When I saw that she was dry when she woke up for about 4 months I finally decided she was ready. She never had an accident and it was just me scared she'd wet the bed. But she did great! She's now 6. My now 4yr. old almost 5 decided when she was 3 that she'd wear her panties to bed and low and behold she didn't have an accident! So she transitioned faster but I think because mommy didn't get in the way and stop her. So go for it!! I think she'll do fine.