Here is the first appearance of Schroeder, on May 30, 1951. He was still a baby.
Then, on September 24, 1951, he was shown playing the piano for the first time.
He had a real love of music from the very beginning. Even the girls began to like him. Schroeder was born due to Schulz gaining an appreciation for classical music later in life.
And, finally, Charlie's first attempts at kite-flying, before the Kite-Eating Tree.