Sing songs that teach body parts. One of the most popular is "Head, Shoulders, Knees and Toes." Various body parts such as eyes, ears, mouth and nose can be substituted into the song, and you can point to the different body parts as you're singing. Another song that can teach body body parts is "If You're Happy and You Know It." You can also substitute various body parts and instructions into this song, such as "stomp your feet" or "rub your belly."
Read books that teach various body parts. As you read to the children, help them correlate what you're reading to them by asking them to point to the different body parts you're reading about.
Buy educational toys that teach youngsters about body parts. You can purchase stuffed animals with labeled body parts or flash cards that will help children master their body part vocabulary.