My baby is 4 months old. He just always puts his fingers in his mouth and sucks. The toy also puts in the mouth. what to do

A. Teether you can introduce to the child as a child may have started to teeth and that is why your child is behaving like this which is a very common thing to be seen so this is going to help in relaxing the gums of your child as a child can choose and bite upon it’s completely safe to be given