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A delayed milestone, which is also known as a developmental delay, refers to a situation where a child does not reach a particular developmental milestone at the expected age. Developmental milestones refer to a collection of indicators that a child is anticipated to reach as they grow older.

Each age group has its distinct set of milestones, representing behaviors that develop gradually and serve as foundational building blocks for growth and ongoing learning. These behavioral milestones fall into various categories of child development stages, including  :


 * Adaptive skills: Activities of daily living, such as putting on clothes, eating, and washing independently.
 * Cognition and intellect: Involves thinking, solving problems, and comprehension.
 * Emotional expression: Includes facial movements, such as a smile when happy, or an action, such as giving a gift to express gratitude
 * Language: Being able to communicate with gesture and/or speech
 * Motor coordination: Encompasses both gross and fine motor skills, such as jumping and drawing.
 * Sensory: Vision, hearing, touch, taste, smell
 * Social interaction: Involves the ability to initiate contact with peers and engage in group play.

Epidemiology
Developmental delay is prevalent in approximately 1-3% of children under the age of 5 worldwide. According to a systematic analysis done for a conducted study in 2016, there are approximately 52.9 million children worldwide under the age of 5 that are affected by some type of developmental delay or delayed milestone. For example, the prevalence of autism spectrum disorders was estimated to be 2.64%. 95% of the children with these delayed milestones live in countries with low to middle income and have very limited availability of healthcare resources. There is a risk of having a delayed milestone if a child live in an under-resourced nation.