My DD is 4 and she started doing something that really bothers me. She is biting her skin on her fingertips. idk why or what to do about it. Everywhere we go,when shes going to bed or just around the house she has one of her fingers in her mouth. Someone told me to put onion on her fingertips cause it would make them taste bitter. Does anyone have any suggest6ions or has anyone dealt with this before??