Read to your child, play with your child, take your child on outings in nature, talk to them about what you see. Name birds and animals and trees and flowers, Show them colors, give them finger paint and chalk and clay and crayons. All of these things you can do with a young child, but…do not try to create a super baby, the best teacher is discovery not pressure to learn and perform. A 9 month old baby needs to learn nothing and just enjoy his/her parents love, reading stories, playing in the bath and the rest will unfold as time wears on.