Thumb sucking...

Nadine • Divorced💕Mommy of 2 👶🏽👶🏽
My daughter is about to be 3 months on the 19th of this month… she has a habit of sucking her thumb till it has blisters; I've tried to hand her toys, but she rather have her thumb! I've tried mittens, but she cries 😩 Is there anything I can do for her to get her mind off her hands???