The Bible doesn't give us many details about Jesus' boyhood—although there isn't any reason to think He didn't run and play like other boys His age. The Bible simply says that as a boy "Jesus grew in wisdom and stature, and in favor with God and men" (Luke 2:52). Those words indicate that even as a young boy Jesus knew He was unique, and was set apart by God for a special mission.
The only glimpse the Bible gives us of Jesus' boyhood years confirms this. Mary and Joseph were devout people, and every year they journeyed to Jerusalem to celebrate one of the major religious feasts. Jesus always went with them—but once, when He was 12, He got separated from them, and they only found Him several days later.
Where was He? They found Him in the Temple, surrounded by religious teachers and scholars and "listening to them and asking them questions. Everyone who heard him was amazed at his understanding and his answers" (Luke 2:46-47). Afterward He told Mary and Joseph, "Didn't you know I had to be in my Father's house?" (Luke 2:49). He already knew that God was His Father and He was God's Son, sent from heaven to save us from our sins.
The most important truth about Jesus, however, is this: He grew up and willingly went to the cross for us. He loves us that much! Have you responded to His love by giving your life to Him?