If you think of it in teams of 'growth and development' then you can link it to various theories- as physical development is also linked to 'growth and maturation' meaning a child needs to acquire certain skills in order to develop.
An example given in Heinmans CCLD NVQ book - Toliet training - 'this is a skill, but the brain has to be mature enough to be able to send signals to and from the bladder pg 134.
hope this helps xxx
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