As a child grows, his or her nervous system becomes more mature. As this happens, the child becomes more and more capable of performing increasingly complex actions. The rate at which these motor skills emerge is sometimes a worry for parents. Caregivers frequently fret about whether or not their children are developing these skills at a normal rate. As mentioned above, rates may vary somewhat. However, nearly all children begin to exhibit these motor skills at a fairly consistent rate unless some type of disability is present.