Luke 1

Luke1:1 Inasmuch as many have taken in hand to set in order a narrative of those things which have been fulfilled33 among us,
Luke1:2 just as those who from the beginning were eyewitnesses and ministers of the word delivered them to us,
Luke1:3 it seemed good to me also, having had perfect understanding of all things from the very first, to write to you an orderly account, most excellent Theophilus,
Luke1:4 that you may know the certainty of those things in which you were instructed.

In the gospel of Luke we can see a great difference with the gospel of John.
In John Jesus' childhood is not described, not even mentioned but it tells us, that "The word became flesh"(so it seems, that Jesus came as an adult from heaven to earth).
In Luke Jesus' childhood is described very detailed, and Luke tells us not only something about Jesus, but also about his environment/backround information(e.g. the birth of John the Baptist described very detailed... although Jesus is the main person). So we can see, that Luke wanted to tell Theophilus everything, he knew about Jesus. He didn't want to miss anything "of those things which have been fulfilled among us"(=of the gospel).
I hope that as we read the gospel of Luke, that we don't forget who wrote this book to whom and that this book is a letter- not a history book!! If we don't forget this, it might be easier for us to understand, why some passages are written in the way they are. And if we imagine how this Theophilus might have read this- with what kind of curiosity- then the reading will be much more interesting for us (because maybe we will think: "Oh, this and that I have already read in the other gospels(Matthew, Mark) - Boring!").
May God help us to keep reading the bible and also to reflect on his word.