my daughter is 2 months old. she is sucking her thumb finger. she is sleeping by sucking her finger. she is not sleeping normally. bitterly crying I I removed that finger from mouth.what to do

A. it is normal in baby at this age to suck finger and it is fine and absolutely nothing to worry and it is just to make the baby comfortable by itself as it will sooth her and nothing to worry but just be sure that it does not replace fingers with the feed apart nothing to worry you can let it distract your child