My little girl is 4 years old. She is not potty trained, she just refuses to give up diapers and being a baby. She still has a bottle, a pacifier, and sleeps in a crib. She still talks like a baby too. She won't even wear pull ups, so i have her in huggies size 6 diapers.She also won't wear big girl clothes, she'll only wear onesies and belly button t shirts.She usually goes to preschool in nothing but a diaper and a belly button t shirt.She's very stubborn.How do i get her to act like a big girl.