Hi, You must be a blessed mummy who have a musically inclined child and I don't see why the point that the teacher was trying to make. Children absorb really fast when they are young. It would be a waste to stop your child from experiencing the beauty of piano as I feel this is the best time for you to instill his love for it. I have two daughters and I exposed them to music really young. Both are loving it. I have a video of my younger daughter playing the piano. Hope it can inspire you to start your child early. Cheerios!