Engage your child in conversations every day. If possible, include new and interesting words in your conversation.
Read to your child each day. When the book contains a new or interesting word, pause and define the word for your child. After you're done reading, engage your child in a conversation about the book.
Help build word knowledge by classifying and grouping objects or pictures while naming them.
Help build your child's understanding of language by playing verbal games and telling jokes and stories.
Encourage your child to read on his own. The more children read, the more words they encounter and learn.