For example, child hood days of Jesus is not described in bible
36 Now there was one, Anna, a prophetess, the daughter of Phanuel, of the tribe of Asher. She was of a great age, and had lived with a husband seven years from her virginity; 37 and this woman was a widow of about eighty-four years, who did not depart from the temple, but served God with fastings and prayers night and day. 38 And coming in that instant she gave thanks to the Lord, and spoke of Him to all those who looked for redemption in Jerusalem.
39 So when they had performed all things according to the law of the Lord, they returned to Galilee, to their own city, Nazareth. 40 And the Child grew and became strong in spirit, filled with wisdom; and the grace of God was upon Him.
41 His parents went to Jerusalem every year at the Feast of the Passover. 42 And when He was twelve years old, they went up to Jerusalem according to the custom of the feast. 43 When they had finished the days, as they returned, the Boy Jesus lingered behind in Jerusalem. And Joseph and His mother[e] did not know it; 44 but supposing Him to have been in the company, they went a day’s journey, and sought Him among their relatives and acquaintances. 45 So when they did not find Him, they returned to Jerusalem, seeking Him. 46 Now so it was that after three days they found Him in the temple, sitting in the midst of the teachers, both listening to them and asking them questions. 47 And all who heard Him were astonished at His understanding and answers. 48 So when they saw Him, they were amazed; and His mother said to Him, “Son, why have You done this to us? Look, Your father and I have sought You anxiously.”
49 And He said to them, “Why did you seek Me? Did you not know that I must be about My Father’s business?” 50 But they did not understand the statement which He spoke to them.
51 Then He went down with them and came to Nazareth, and was subject to them, but His mother kept all these things in her heart. 52 And Jesus increased in wisdom and stature, and in favor with God and men.