Those opening intervals are magical. This piece introduces the child to the "mysterious" register of the piano (high, tinkly sounds). It also teaches arpeggios (broken chords) without the student realizing they are learning theory.
For decades, Piano Pieces for Children (Everybody's Favorite Series, No. 3) Piano Pieces For Children -Everybody
This is arguably the most famous starter piece in history. It teaches independent hand coordination and introduces basic polyphony, where both hands play distinct, important melodies. 2. Robert Schumann: The Master of Imagination Those opening intervals are magical