Hi billybob,
I would say that you need to be thinking of Holistic development which is basically where each area of development (physical, social & emotional, cognitive etc) needs the other in order for the child to develop to their full potential.
So for example a child who cannot sit up, turn pages of a book or have the language development to decode the text will not be able to read a book.
Think of develpment as a whole.
Hope this helps a bit.
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