My 4 month 10 days baby drooling a lot and putting everything in mouth (anything which are around her) what to do?

A. Thumb sucking/putting fingers into mouth may be normal at this age  It may also be due to infection, teething, insecure feeling,  If possible give teether  Distract ur Baby whenever he or she will do this.  It will help.  Keep ur baby well hydrated  Baby should pass minimum urine 6-8 times per day