John the Baptist is the baby from week 1, the son of Zacharias and Elisabeth, all grown up. He lived in the wilderness, wore rough clothes of camel’s hair and ate locusts and wild honey (Matthew 3:4). Long before, Isaiah had said a voice would call out, “Prepare ye the way of the Lord” (Matthew 3:3). John’s job was to get people ready for Jesus. He taught them to repent, which means to turn away from wrong choices and turn back to God, and he baptized them in the Jordan River. When people asked what they should do, he gave simple answers, like sharing an extra coat and food with someone who has none (Luke 3:10–11).
Then Jesus came from Galilee to be baptized by John (Matthew 3:13). Jesus never did anything wrong, but He was baptized to obey Heavenly Father and show all of us the way (Matthew 3:15; see also 2 Nephi 31:5–9). He went all the way under the water and came straight up out of it. The heavens opened, the Holy Ghost came down with the sign of a dove, and Heavenly Father’s voice said, “This is my beloved Son, in whom I am well pleased” (Matthew 3:16–17). All three members of the Godhead were there at once: Jesus in the water, the Holy Ghost, and Heavenly Father’s voice from heaven. They are three separate beings.
This is the most important lesson of the month for your 7-year-olds, who will be baptized when they turn 8. Show them how their baptism will be like Jesus’s: someone with priesthood authority, all the way under the water, and a promise to follow Jesus. After baptism they will be confirmed and receive the gift of the Holy Ghost, who comforts, guides and teaches. The 4- and 5-year-olds can learn that the Holy Ghost is a gentle helper, like the gentle dove, and that they are getting ready too.
One more wonderful fact: in 1829, John the Baptist came back as a resurrected being and gave the Aaronic Priesthood to Joseph Smith and Oliver Cowdery (Doctrine and Covenants 13). That priesthood is used to baptize children today. Keep the doctrine simple and exact: no child plays Jesus or Heavenly Father in class. You read Their words, and the kids play John, the river, the crowd and the dove.