At least once in his public ministry, somewhere, Jesus said to some people: "Unless you turn around and become like little children, you won't enter the kingdom of heaven."
When Jesus himself was a little child, he did enter the Kingdom of Heaven. He sat at the Nazareth Synagogue - and while I couldn't tell you if anyone else was learning anything - Jesus learned of his Father. One of the first things Jesus learned there, as a child, was the Shema.
Brian Fulthorp has a great post about that tonight. [Update: Link fixed!] I'd better warn some of you, Brian uses the "o" word. I prefer not to use that word out loud, as often as humanly possible. But I do believe that what Brian says happens to be true. And it's very important. So go check it out.