Jesus is God, the Second Person of the Trinity. As a child, God-made-human is the eternal timeless God united to the human nature of himself as a child. And though the child passes through time and becomes an adult, the eternity of the Divine Nature means that the child Jesus can affect all times and places. So we can ask the intercession of Jesus, our Mediator, as an infant or child. And the eternal God forever exists united to the human nature of Christ as a child, within time in His human body, but eternally in His Divine Nature. So the divine Nature does not forget the human nature when He was a child, but He continues to bless humanity from His human nature as a child.
More importantly, Jesus on the Cross pours forth His graces upon all times and places, and forever blesses all Creation, especially the elect.