All children are unique and a lot of their developmental milestones happen naturally as they get older, however some can be affected by different life factors, such as health, environment and background and more specific skills can be learnt and encouraged. There is an expected pattern of development but all children are individual and therefore the rate will vary.
There are four categories of development:
Physical Development (Birth - 1 year) - The development of control over one's own body in both gross and fine motor skills is the infant's primary physical task, culminating toward the end of the first year in walking.
(1-2 years) - The infant perfects the gross and fine motor skills that emerged during the first year by developing balance, coordination, stability, and an improved ability to manipulate objects.
(2-3 years) - The child develops increased strength and uses motor skills to master challenges in the environment, such as stairs, balls, playground equipment, cutlery, crayons, and other objects.
(3-6 years) - Most basic gross motor abilities have emerged. Existing skills are practiced and perfected, and the child develops mastery in applying motor skills to increasingly challenging and complex situations.
(6-11 years) - The child practices, refines, and masters complex gross and fine motor and perceptual-motor skills.
(12-19 years) - Physiological changes at puberty promote rapid growth, the maturity of sexual organs, and development of secondary sex characteristics.
Cognitive Development (Birth - 1 year) - Cognition begins with alertness, awareness, recognition, and interest in visual, auditory, and tactile (touch) stimuli. As motor development improves, the infant begins to explore and manipulate objects and develops some understanding of their properties.
(1-2 years) - The emergence of symbolic thought is central to cognitive development. This results in the