**Question:** A 3 year old child has normal developmental milestones except delayed language development (poor speech development). He has difficulty in concentration, communication, and making friends (i.e. he has no friends) and spends time seeing his own hands. The most probable diagnosis is:

A. Autism Spectrum Disorder (ASD)
B. Cerebral Palsy
C. Developmental Coordination Disorder (DCD)
D. Attention Deficit Hyperactivity Disorder (ADHD)

**Correct Answer:** A. Autism Spectrum Disorder (ASD)

**Core Concept:**
Autism Spectrum Disorder (ASD) is a neurodevelopmental disorder characterized by impairments in social interaction, communication, and repetitive and restricted behaviors. In children, these symptoms can manifest as delayed language development, difficulty in concentration, communication, and making friends. The condition is also associated with self-stimulatory behaviors, such as fixating on own body parts.

**Why the Correct Answer is Right:**
ASD is the most suitable diagnosis for the presented symptoms, as it encompasses the core features mentioned in the question. The child exhibits delayed language development, social interaction difficulties, and self-stimulatory behaviors, which are all characteristic of ASD.

**Why Each Wrong Option is Incorrect:**

A. Cerebral Palsy (CP) is a group of disorders affecting movement and muscle coordination, typically caused by injury or damage to the developing brain. While CP can affect communication and social skills to some extent, it is not primarily characterized by delayed language development and repetitive behaviors.

B. Developmental Coordination Disorder (DCD), also known as developmental dyspraxia, is a condition affecting motor coordination skills, typically involving clumsiness and difficulties with balance and spatial awareness. Although DCD can affect communication, it is not associated with delayed language development and self-stimulatory behaviors like fixating on own body parts.

C. Attention Deficit Hyperactivity Disorder (ADHD) primarily affects attention span, impulsivity, and hyperactivity. The child in the question exhibits delayed language development, social interaction difficulties, and self-stimulatory behaviors, which are not typical features of ADHD.

D. Attention Deficit Disorder (ADD) is a related condition to ADHD and shares similar features, but it is not characterized by self-stimulatory behaviors and delayed language development.

**Clinical Pearl:**
In children, delayed language development, self-stimulatory behaviors, and social interaction difficulties should raise suspicion for Autism Spectrum Disorder (ASD) or a related neurodevelopmental disorder like ASD. Early identification and intervention are crucial in improving the quality of life for the child and their family. This case highlights the importance of a comprehensive clinical evaluation and multidisciplinary approach in diagnosing and managing neurodevelopmental disorders in children.