Dont put pressure on ur baby..keep removing the hand. If she doesnt stop, wait till she is about 1yr..then wrap plaster lightly over the thumb..for like 2 weeks. Change it every day or two. She will forget it. Thats what i did for my first son!
Well, i got her toys to keep her hands busy, she used to put her finger in her mouth and i wasnt disturbt cos she used to do dt when she is hungry. She will clock two very soon and she stopt herself , mayb cos i kept her busy by playing with lots of toys. Thanks.