they should not be and u need to get that stopped
No. But don't suck on your thumb, it's weird.
They CAN suck their thumb, however by that age, they should have grown out of it.
No.
Babies mostly do
Sucking of the thumb is a bad habit that cant be stopped easily. Wrap paper tape on your thumb if it there you wontwon't want to suck it. Do this for some months. The habit should stop.
you suck your thumb
yes
there are millions of flying bugs that suck yr blood............*
Yes and, in fact, there are a plethora of adult thumb suckers who currently exist.
you will get an over bite KOrenblatt
Get him to suck something else...
Up to 80% of children under age 2 suck their thumb with the percentage decreasing with age. It is estimated that up to 2% of adults continue the habit, with the highest (unrealistic) estimate at 12%. The largest fall off occurs between the ages of 4-6, with the next fall off occurring at 8-12, slowly diminishing thereafter.