Why some development can occur at different rates for individual children

External and Internal factors can affect an idividual child's development rate.

Internal factor are to do with the child themself.

Internal: e.g. If a child has had tummy problems they may be hesistant or slow to have regular 'tummy time', which usually progresses to rolling onto their back and front, then crawling.

External factors are things such as the environment.

External: e.g. Living away from society can boost physical activity but hinder social development. Living far away from a library or early child-care centre can hinder social and cognitive learning but help with creativity with finding new ways to learn effectively.