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Trivandrum Developmental Screening Chart (TDSC) - Complete Guide

What is the TDSC?

• It screens children from 0 to 6 years of age
• It uses 51 developmental milestones arranged in 2 charts:
  • Chart 1: 0-3 years (items 1-51 roughly)
  • Chart 2: 3-6 years
• Each milestone is shown as a horizontal bar spanning the age range during which that milestone is normally acquired
• The x-axis = Age in months
• Each bar has a black dot/mark indicating the median age at which the milestone is achieved

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How to Read the Chart

Color Coding

• Orange/Light bars = Gross motor or language milestones
• Dark red/Brown bars = Fine motor or personal-social milestones
• The bars span from the earliest age to the latest age at which a milestone should normally appear

The Black Dot

• The black dot on each bar = the 50th percentile (median) age for that milestone
• If a child has NOT achieved a milestone and the black dot for that milestone is already past the child's current age, the child is delayed for that item

How Screening Works (The Vertical Line Method)

1. Draw a vertical line at the child's current age (in months) on the x-axis
2. All milestones whose black dot falls to the LEFT of the vertical line should already be achieved
3. If the child fails 3 or more milestones whose median age is past the child's current age, the child is considered developmentally delayed - refer for full assessment
4. If the child fails even 1 milestone, it warrants close follow-up

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TDSC 0-3 Years: Key Milestones (Bottom to Top = Youngest to Oldest)

Gross Motor Milestones

Fine Motor Milestones

Language Milestones

Personal-Social Milestones

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TDSC 3-6 Years: Key Milestones

Gross Motor

Fine Motor / Cognitive

Language

Personal-Social

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TDSC Scoring

• Draw vertical line at child's current age in months
• Count milestones whose median (black dot) is to the left of that line
• Child must pass all those milestones
• Failure = unable to perform a milestone when median age has passed
• Developmental delay suspected: Failure of 3 or more items
• Refer for detailed evaluation (Gesell, Bayley, DASII)

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Viva Questions on TDSC (With Detailed Answers)

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• TDSC covers 0 to 6 years (0-72 months)
• It has 51 milestones divided across 2 charts:
  • Chart 1: 0-3 years
  • Chart 2: 3-6 years

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1. Note the child's exact age in months
2. Draw a vertical line on the chart at that age
3. Identify all milestones whose black dot lies to the LEFT of the line - these should already be achieved
4. Test the child for those milestones
5. If the child fails 3 or more milestones, developmental delay is suspected and referral is indicated

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1. Gross Motor - large muscle movements (rolling, sitting, walking, running)
2. Fine Motor/Adaptive - hand-eye coordination, manipulation (grasping, building, drawing)
3. Language - receptive and expressive communication
4. Personal-Social - self-care, social interaction, play

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• Screening (e.g., TDSC, Denver II) = quick, simple, identifies children at risk - does NOT diagnose
• Assessment (e.g., Bayley Scales, Gesell, DASII) = detailed, comprehensive evaluation done by trained professionals - provides diagnosis and developmental age

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• No babble by 12 months
• No single words by 16 months
• No 2-word phrases by 24 months
• Any loss of previously acquired language at any age

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• 3 months: Not smiling, not fixing and following
• 4 months: Persistent head lag
• 6 months: Not reaching for objects, no vocalizing
• 9 months: Not sitting unsupported
• 12 months: Not standing, not saying any words
• At any age: Loss of previously acquired milestones (regression - most alarming sign)

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• Neurodegenerative disease (e.g., metachromatic leukodystrophy, Rett syndrome)
• Metabolic disorders (e.g., neuronal ceroid lipofuscinosis)
• Psychosocial causes (e.g., after trauma, new sibling) - but these cause temporary regression in higher-order skills only

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• Chromosomal disorders (Down syndrome, trisomy 18)
• Congenital infections (TORCH)
• Intrauterine growth restriction
• Teratogens (alcohol - FASD)

• Birth asphyxia / hypoxic-ischemic encephalopathy (HIE)
• Hyperbilirubinemia / kernicterus
• Prematurity

• CNS infections (meningitis, encephalitis)
• Hypothyroidism (if untreated)
• Severe malnutrition
• Lead toxicity
• Deprivation/neglect

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• TDSC was normed on Indian children, making it more culturally valid
• It is simpler and uses fewer items (51 vs 125 in Denver II)
• It is cheaper and can be used by trained community health workers (ASHA, ANM)
• The bar chart format is easier to use visually at the bedside
• Denver II was normed on American children and may not reflect the developmental timeline of Indian children accurately

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• Orange/Light colored bars typically represent language and gross motor milestones
• Dark red/Brown bars represent fine motor and personal-social milestones

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• Cerebral palsy (most common cause of delayed walking)
• Neuromuscular disorders (Duchenne muscular dystrophy, spinal muscular atrophy)
• Intellectual disability
• Normal variant ("bottom shufflers" may walk later)

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• Increased items from 105 to 125
• Added a language section (expressive and receptive)
• New normative data
• Replaced "abnormal/normal" with "normal/suspect/untestable"
• Uses same 4 domains: GM, FM-Adaptive, Language, Personal-Social

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• Rides tricycle (~36 months)
• Names colors (~36 months)
• Draws a person (~42-48 months)
• Hops on one foot (~42 months)
• Copies a square (~48 months)
• Skips (~48-54 months)
• Counts 10 objects (~48-60 months)
• Names opposite analogies (~60 months)
• Writes own name (~60-72 months)
• Reads a sentence (~66-72 months)
• △ △ O shape test - copy shapes (triangle, circle) tested around 36-48 months

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• Circle - achieved around 3 years
• Cross (+) - achieved around 3.5-4 years
• Square - achieved around 4-4.5 years
• Triangle - achieved around 5 years

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Quick Memory Aid for Viva

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How to Read the TDSC Chart - Super Simple Guide

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🔢 STEP 1 - Understand the Bottom Line (X-axis)

0   1   2   3   4   5   6   7   8   9   10  11  12 ... 36

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📊 STEP 2 - What is Each Colored Bar?

• One bar = "Smiling"
• One bar = "Sitting"
• One bar = "Walking"

• Left end of bar = earliest age a child can learn this skill
• Right end of bar = latest age by which child should learn this skill
• The whole bar = the NORMAL range for that skill

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⚫ STEP 3 - The Black Dot is the MOST IMPORTANT Thing

Black dot = the age by which 50% of normal children already have this skill

• If black dot is at 6 months for "sitting" → half of all normal children can sit by 6 months
• If YOUR child is 8 months old and STILL cannot sit → ⚠️ that's a concern

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✏️ STEP 4 - The Golden Rule: Draw a Vertical Line

1. Find the child's age in months on the bottom (X-axis)
2. Draw a straight vertical line upward at that age
3. Look at which black dots are to the LEFT of your line
4. Those are all the skills the child should already have
5. Test the child for those skills

Simple Example:

Child is 12 months old Draw line at 12 All bars whose black dot is before 12 = the child must be able to do those things If child cannot do 3 or more of them → REFER for further testing

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🚦 STEP 5 - What Do the Results Mean?

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🎨 STEP 6 - What Do the Colors Mean?

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📖 Real Life Example (Very Simple)

1. Draw a line at 10 months on the chart
2. You see these black dots are before 10 months:
   • Social smile ✅ (should have by 2 months)
   • Head control ✅ (should have by 4 months)
   • Sitting without support ✅ (should have by 8 months)
   • Pincer grasp (black dot at 9-10 months)
3. Test the baby for ALL these
4. If baby cannot sit without support (black dot was at 8 months) AND cannot grasp with fingers AND not saying mama/dada = 3 failures = REFER

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🧠 One-Line Summary to Remember

"Draw a line at child's age → count how many black dots the child FAILED to cross → 3 or more failures = refer"

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Why the Bars Go Diagonally (Bottom-left to Top-right)?

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🍼 Imagine This Story...

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📏 The Chart is Just a RULER of AGE

| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | ... | 36 |

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🟠 Each Colored Bar = One Skill

🟠 "This orange bar is the skill WALKING"

• Where it STARTS = the earliest a baby can walk
• Where it ENDS = the latest a baby should walk
• The ⚫ BLACK DOT inside = the age when MOST babies walk

So for WALKING:

Month:     10 ----⚫---- 15
                  ↑
           Most babies walk by 12 months (dot is here)

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✏️ The ONE Thing You Do - Draw a Line

• Can baby smile? ✅ or ❌
• Can baby sit alone? ✅ or ❌
• Can baby walk? ✅ or ❌
• Can baby say mama/dada? ✅ or ❌

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🚦 Count the ❌'s

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🧱 Why Does the Chart Look Like a Staircase?

TOP-RIGHT   → Walking, Talking in sentences (harder, later)
       ↗
BOTTOM-LEFT → Smiling, Head control (easy, early)

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🎯 The Whole Chart in 3 Sentences

1. Bottom numbers = child's age in months
2. Each bar = one skill the child must learn. The black dot = the age by which most children learn it
3. Put your finger at child's age. Count how many black dots the child has NOT crossed. If 3 or more = refer