Response to 'Jean Piaget's theory on child language development' article

I think that her 4 stages of language development links to the order a child learns language, as there are a high amount of concrete nouns in a child's first 50 words and there are not many abstract feelings and nouns, they are all items you can see along with action words and personal and social words. 
the use of concrete nouns links to the Jean Piaget theory as she states that a child only really starts to use abstract idea when they get to ages 11 or 12 and before then language is only used to express specific ideas, ones that the child can see, "ball" "apple" etc.