Should i try and stop my baby from sucking her thumb?

No: Sucking is a fantastic self-soothing behavior and if it is "forced" to be eliminated, one may see other behavioral problems soon follow.

Not yet: Sucking reflex is normal behavior. Most children give up thumb as toddlers. If thumb or finger sucking persists beyond age four it can cause narrowing of upper jaw, slow down lower jaw growth, and create serious orthodontic problem. Digit habit beyond age 4 should be gently discouraged...It's not a harmless habit. If still present by school age, child may need professional emotional support.