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📘 Overview
Down syndrome is a genetic condition caused by an extra copy of chromosome 21 (Trisomy 21). This affects development, learning, and physical growth.
It is the most common chromosomal condition, affecting approximately 1 in 700 babies in the United States.
People with Down syndrome may have mild to moderate intellectual disability, but many live long, active, and meaningful lives with appropriate support.
🧬 Causes
Down syndrome occurs due to a cell division error resulting in extra genetic material from chromosome 21.
Types
- Trisomy 21 (95%) – extra chromosome in every cell
- Mosaic Down syndrome (2%) – some cells affected
- Translocation (3%) – part of chromosome attaches to another chromosome
👉 The exact reason the error occurs is unknown.
⚠️ Risk Factors
- Advanced maternal age (especially over 35)
- Genetic chance events during cell division
🧠 Developmental Impact
Down syndrome affects both learning and physical development.
Common developmental features:
- Delayed speech and language development
- Slower motor development (sitting, walking, crawling)
- Mild to moderate intellectual disability
- Differences in problem-solving and memory processing
🧍 Physical Characteristics
Not every person has all features, but common traits include:
- Flattened facial profile
- Small nose and upward-slanting eyes
- Short neck
- Low muscle tone (hypotonia)
- Small hands and feet
- Single crease across palm (simian crease)
- Small ears and short fingers
🏥 Health Complications
Some individuals may experience medical conditions including:
- Congenital heart defects (common at birth)
- Hearing and vision problems
- Thyroid disorders
- Weak immune system
- Respiratory infections
- Increased risk of Alzheimer’s disease in later life
🧑⚕️ Diagnosis
- Often identified at birth through physical features
- Confirmed through genetic testing (karyotype analysis)
- Prenatal screening is also available
🧩 Support and Management
There is no cure, but support greatly improves quality of life.
Key supports include:
- Early intervention programmes
- Speech and language therapy
- Occupational therapy
- Physical therapy
- Inclusive education plans (IEPs)
🌱 Prognosis
With modern healthcare and support:
- Many individuals live into adulthood (and older age)
- Can attend school, work, and participate in community life
- Independence levels vary depending on support needs
📌 Key Summary
Down syndrome is:
- A genetic chromosomal condition
- Caused by extra chromosome 21
- Associated with developmental delay and distinct physical traits
- Supported through early intervention and lifelong care
- Compatible with a full and meaningful life
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