my baby is 14 months old , what all he needs to learn by this time . He says words like Amma(mother) , nanna (father), thatha , ,atha ,dada. he is walking (unstable) . I'm trying to make him learn to stack the rings and identify his body parts but not atall concentrating . he gives hand shake if we strech hand. may I know how to teach him stacking and body parts n other things