The child was growing, and becoming strong in spirit, and was in the desert until the day of his public appearance to Israel.
Now you remember in Matthew's gospel when Joseph found out that Mary was pregnant, and he was really troubled by it, because they were espoused. He thought he might just give her a bill of divorcement, put her away privately, because if he would her expose her publicly she'd be stoned to death. And the angel of the Lord came to Joseph at night and said, "Fear not to take Mary as your wife. That which is conceived in her is of the Holy Spirit, and thou shalt call His name Jehoshua" ( Matthew 1:20-21 ). So both Mary and Joseph were instructed by the angel of the Lord in the naming of Jesus. But when he told Joseph, "Call his name Jehoshua," he said, "For He shall save His people from their sins."