My 4-month-old is drooling and chewing on his hand. Does this mean he's teething?

Usually, babies start teething at around 4 to 7 months. The process of teething may cause some discomfort for your little one as he gets his first set of teeth. When teeth start to arrive, establish a routine of cleaning them twice a day. Wrap a damp facecloth or gauze around your finger and wipe the teeth.