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As a child grows and develops, he learns different skills, such as taking a first step, smiling for the first time, or waving goodbye. These skills are known as developmental milestones. A child with a developmental delay (a milestone delay of more than 2 standard deviations below the norm) does not reach these milestones at the same time as other children the same age. Most often, at least initially, it is difficult or impossible to determine whether the delay is permanent (i.e., known as a disability) or whether the child will ‘catch-up’ and be ‘normal’ or nearly ‘normal.’ There are five main groups of skills that make up the developmental milestones. A child may have a developmental delay in one or more of these areas.
Usually, there is an age range of several months where a child is expected to learn these new skills. If the normal age range for walking is 9 to 15 months, and a child still isn't walking by 20 months, this would be considered a developmental delay (2 standard deviations below the mean). A delay in one area of development may be accompanied by a delay in another area. For example, if there is a difficulty in speech and language, a delay in other areas such as social or cognitive development may coexist.
It is important to identifyearly so that treatment can minimize the effects of the problem. Parents who have concerns about their child's development should consult the family physician, who, in turn, might make a referral to a developmental pediatrician, developmental psychologist or pediatric neurologist. . The consultant can evaluate the child and recommend treatments and therapies that might benefit the child.