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Developmental Milestones of Children - Australian Guidelines

Important note: Milestones are ranges, not fixed deadlines. Children develop at different rates - the ages below represent when most children achieve each skill. Always consult a maternal and child health (MCH) nurse or GP if you have concerns.

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Areas of Development Tracked

• Gross motor - large body movements (sitting, walking, running)
• Fine motor - hand and finger skills (grasping, drawing)
• Communication/Language - understanding and speaking
• Cognitive/Thinking - learning, problem-solving, memory
• Social and emotional - relationships, play, self-regulation
• Self-care - feeding, dressing, toileting

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Newborn (0-1 month)

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1-2 Months

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4 Months

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6 Months

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9 Months

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12 Months

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15 Months

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18 Months

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2 Years (24 Months)

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2-3 Years (Toddler)

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3-4 Years (Preschool)

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4-5 Years

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5-6 Years (School Entry)

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6-8 Years (Early School Age)

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9-11 Years (Late Primary)

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12-17 Years (Adolescence)

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When to Seek Help

• Loses skills they previously had (regression is always worth investigating)
• Is not meeting milestones in multiple areas
• Has consistently delayed or absent speech, limited eye contact, or poor social engagement
• Is not walking by 18 months
• Has fewer than 50 words at age 2 or is not combining 2 words

Australian Support Services

• Maternal and Child Health (MCH) nurse - free service for all children
• Raising Children Network - Australian Government-funded resource
• Healthdirect (1800 022 222) - free 24/7 nurse advice
• Pregnancy, Birth and Baby (1800 882 436) - maternal child health nurse line, 7am-midnight daily
• Starting Blocks - Australian Government early childhood resource

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Sources: Raising Children Network (Australian Government, reviewed October 2025); Healthdirect Australia (reviewed August 2025); Berry Street Child Developmental Milestones Guide; Textbook of Family Medicine 9e; Kaplan & Sadock's Synopsis of Psychiatry.

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Developmental Milestones (0-5 years) - AMC MCQ High-Yield

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Master Mnemonic: "SMILES GROW"

Use this to remember the domains checked at every age:

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AMC High-Yield Milestone Chart (0-5 Years)

Key Rule: "The Rule of 4s"

Each milestone roughly advances every 3-4 months in infancy, then annually. The AMC loves testing one domain at a specific age - if the vignette gives you the age, you must identify the expected milestone.

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🔴 NEWBORN (0-1 month)

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🟠 2 MONTHS

⭐ AMC favourite: Social smile = 6-8 weeks. If absent at 3 months = red flag.

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🟡 4 MONTHS

⭐ AMC pearl: No head lag by 4 months. Still present at 6 months = investigate.

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🟢 6 MONTHS

⭐ AMC favourite: Babbling = 6 months. Sitting with support = 6 months.

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🔵 9 MONTHS

⭐ AMC pearl: Stranger anxiety peaks at 9 months. Object permanence = 9 months.

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🟣 12 MONTHS (1 YEAR)

⭐ AMC RED FLAGS at 12 months: No words, no pointing, no waving, no shared gaze = possible autism screen.

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⚪ 15 MONTHS

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🔴 18 MONTHS

⭐ AMC RED FLAG at 18 months: Fewer than 6-10 words = refer. Not walking = investigate.

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🟠 2 YEARS (24 MONTHS)

⭐ AMC RED FLAG: No 2-word phrases by 2 years = refer.

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🟡 3 YEARS

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🟢 4 YEARS

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🔵 5 YEARS

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MASTER MNEMONIC - Drawing Milestones (Fine Motor)

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MASTER MNEMONIC - Block Tower

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MASTER MNEMONIC - Walking & Motor

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MASTER MNEMONIC - Language

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AMC-Specific Red Flags (High Yield)

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Quick AMC Play Milestones (Commonly Tested)

⭐ AMC favourite: A 2-year-old playing next to another child but not interacting = normal parallel play, not a social delay.

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Quick Reflex Disappearance Table

⭐ AMC pearl: Persistence of primitive reflexes beyond expected age = CNS pathology. Babinski is normal up to 18 months.

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Neck Pain with Restricted Rotation in a 3-4 Year Old Child

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Most Likely Diagnosis: Acquired Torticollis

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Differential Diagnosis - Ranked by Likelihood

1. MUSCULAR TORTICOLLIS (Most Common - ~70-80%)

• Minor unrecognised trauma (fall during play)
• Sleeping in an awkward position
• Upper respiratory tract infection (URTI)

• Sudden onset, often on waking
• Head tilted toward affected SCM, chin rotated away
• Palpable SCM spasm on the contralateral side
• No fever, no neurological signs
• Resolves in 7-10 days with conservative care

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2. GRISEL'S SYNDROME / ATLANTOAXIAL ROTATORY SUBLUXATION (AARS) - Important!

• Pharyngitis, tonsillitis, URTI, otitis media
• Post-adenotonsillectomy (classic trigger)
• Inflammation causes ligamentous laxity at the C1-C2 joint

• Persistent painful torticollis not resolving with simple analgesia
• History of recent throat/ear infection or recent ENT surgery
• "Cock-robin" posture: head tilted + rotated, chin pointing away
• Resists passive correction
• Often afebrile at presentation

Key teaching point: Always suspect AARS/Grisel's when torticollis follows an URTI or tonsillectomy/adenoidectomy in a young child - Scott-Brown's Otorhinolaryngology.

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3. CERVICAL LYMPHADENITIS

• Painful cervical lymph node enlargement causing restricted movement
• Usually with fever, tender nodes, preceding URTI
• Most common bacterial cause: Group A Streptococcus or Staph aureus

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4. RETROPHARYNGEAL ABSCESS (RED FLAG - Must Not Miss)

• Neck stiffness + drooling + dysphagia + fever + unwell child
• Extension of neck worsens pain (important sign)
• Life-threatening - requires urgent CT neck and surgical drainage
• Can cause AARS by contiguous inflammation

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5. OTHER CAUSES (Less Common in This Age)

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IMMEDIATE ASSESSMENT - RED FLAGS Requiring Urgent Action

Refer/investigate immediately if any of the following:

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DIAGNOSIS - Investigations

Step 1: History

• Onset (sudden on waking vs gradual)
• Recent URTI, tonsillitis, ear infection, or surgery
• Trauma (witnessed or unwitnessed)
• Medications (dystonic reaction?)
• Associated fever, dysphagia, drooling, neurological symptoms

Step 2: Examination

• Position of head: tilt + rotation direction
• Palpate SCM: spasm side (opposite to chin direction in muscular torticollis)
• Lymph nodes: tender/enlarged?
• Neurological exam: tone, power, reflexes
• Oropharynx: tonsillar swelling, posterior wall bulge (retropharyngeal abscess)
• Eye movements (ocular torticollis)

Step 3: Imaging

Rosen's Emergency Medicine: The pre-dental space should be <5 mm in children under 6 years old. Traumatic atlantoaxial rotatory subluxation is differentiated from muscular torticollis by history, time course, and absence of SCM spasm on the contralateral side.

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MANAGEMENT

A. Muscular Torticollis (Most Cases)

1. Reassurance - parents and child
2. NSAIDs - Ibuprofen 5-10 mg/kg/dose every 6-8 hours (with food)
3. Paracetamol for breakthrough pain
4. Heat to neck (warm pack 10-15 min, 3-4 x/day)
5. Soft collar for comfort (24-48 hours only, not long-term)
6. Gentle mobilisation - encourage gentle movement within pain-free range
7. Physiotherapy if not resolving in 7-10 days
8. Expected resolution: 7-10 days; refer if not resolved by 2 weeks

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B. Grisel's Syndrome / AARS - Fielding-Hawkins Classification & Management

• Treat the underlying infection: antibiotics (amoxicillin-clavulanate if bacterial URTI)
• Anti-inflammatory: ibuprofen + muscle relaxants
• Immobilisation: soft collar (Type I) or hard collar (Type II)
• Neurological check every 2 weeks
• If no improvement in 4 weeks with conservative care → cervical traction
• Physiotherapy only when pain is controlled (below pain threshold)
• Refer to paediatric orthopaedics or spinal surgeon for Type II-IV

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C. Retropharyngeal Abscess

• Urgent hospital admission
• IV antibiotics (cover anaerobes + Group A Strep)
• CT neck with contrast
• Surgical drainage if fluctuant/unresponsive to antibiotics
• Airway monitoring

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D. Cervical Lymphadenitis

• Antibiotics if bacterial (flucloxacillin or amoxicillin-clavulanate)
• NSAIDs + warm compress
• Review in 48-72 hours
• Refer if not improving (consider abscess formation)

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Summary Flowchart

Child 3-4 yrs with painful neck rotation
          ↓
RED FLAGS? (fever + unwell, trauma, neuro signs, dysphagia)
    YES → Urgent imaging (CT neck/C-spine) + admit
    NO ↓
Recent URTI / sore throat / ear infection?
    YES → Consider Grisel's/AARS: X-ray C-spine, consider CT
    NO ↓
Woke up with stiff neck / minor trauma?
    YES → Likely MUSCULAR TORTICOLLIS
          → Ibuprofen + heat + soft collar + review 7-10 days
              ↓
         Not resolving at 2 weeks? → Imaging + refer

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AMC Key Takeaways

• Child bent forward/flexed neck to look down at their feet
• After that: severe pain on left lateral rotation + mild pain on right
• This is an acute onset, post-flexion, asymmetric neck pain

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Diagnosis: Atlantoaxial Rotatory Subluxation (AARS)

Also called: Atlantoaxial Rotatory Displacement / Rotatory Fixation

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Why This Diagnosis Fits Perfectly

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What Is AARS? (The Mechanism)

Normal C1-C2:
    [C1 Atlas] rotates freely on [C2 Axis]
    Held in place by transverse ligament + alar ligaments

In AARS:
    Sudden flexion/rotation → C1 slips and locks in a rotated
    position on C2 → cannot return to neutral
    → "Cock-Robin" posture

• Ligaments at C1-C2 are proportionally more lax in young children
• The C1-C2 facet joints are more horizontal (shallower) than in adults
• Large head relative to neck musculature = more torque force on upper cervical spine
• Even minor trauma (bending down, twisting, reaching) can trigger it

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Classic "Cock-Robin" Posture

      HEAD:   Tilted to ONE side  (e.g., right)
      CHIN:   Rotated to OPPOSITE side (e.g., left)
      NECK:   Slightly flexed

This looks exactly like a robin tilting its head - hence the name.

• Pain on rotating left = C1 has locked rotated to the right (or vice versa)
• Head likely tilted right, chin pointing left
• Trying to rotate toward the locked side = maximum pain

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Fielding-Hawkins Classification (Treatment Guide)

This child, with no trauma history other than bending forward, most likely has Type I (pure rotatory, no displacement).

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Investigations

Step 1: X-ray Cervical Spine

• AP + Lateral views - may show rotation but hard to interpret in young children
• Open-mouth odontoid view (if child is cooperative, usually >5 years) - shows asymmetric spacing of C1 lateral masses around the dens
• Pre-dental space: should be <5 mm in children under 6 years

Step 2: CT Cervical Spine (Gold Standard)

• Dynamic CT (head rotated left + right) is the definitive test
• Shows the rotatory malalignment of C1 on C2
• Distinguishes Type I from II/III/IV
• When C1 fails to de-rotate with head movement = fixed subluxation

Step 3: MRI (if needed)

• Used if neurological symptoms are present
• Assesses spinal cord, ligaments (transverse + alar ligaments)
• Not routine for uncomplicated AARS

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Management - Based on Duration of Symptoms

This child is ACUTE (just happened) - Duration < 1 Week

IMMEDIATE MANAGEMENT:

• Apply a soft collar immediately for comfort and to prevent further displacement
• Do NOT attempt forceful passive correction - can worsen subluxation

• Ibuprofen (NSAID): 5-10 mg/kg every 6-8 hours with food
• Paracetamol: 15 mg/kg every 4-6 hours for breakthrough pain
• Muscle relaxant (e.g., diazepam 0.1 mg/kg if significant spasm) - only under medical supervision

• Bed rest with collar in place
• Warm pack to posterior neck (10-15 min, 3-4 x/day) to ease spasm

• Gentle, pain-free range of motion exercises as pain settles
• Do NOT force movement against pain

• If resolving: wean collar, continue gentle physio
• If not resolving → escalate as below

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If Symptoms Persist 1 Week - 1 Month

• Hospital admission or supervised home head halter traction (5 lbs)
• Muscle relaxants + analgesics
• After reduction confirmed: soft collar immobilisation for 4-6 weeks
• Follow-up CT to confirm reduction

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If Symptoms Persist > 1 Month

• Halo traction for up to 3 weeks with gradual weight increase
• If reduction achieved → halo vest immobilisation for 6 weeks
• Then hard collar for further weeks

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If > 3 Months OR Neurological Deficit OR Failed Conservative Treatment

• Surgical: C1-C2 posterior spinal instrumentation and fusion
• This is the last resort and uncommon in acute cases

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Summary Management Ladder

ACUTE (<1 week) - THIS CHILD
    ↓
Soft collar + Ibuprofen + Paracetamol + Rest + Heat
    ↓ (review in 5-7 days)
Resolving? → Continue, wean collar, gentle physio
Not resolving?
    ↓
1 week - 1 month: Traction (head halter) + muscle relaxants
    ↓
>1 month: Halo traction
    ↓
>3 months / neuro deficit: C1-C2 fusion

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Red Flags - Refer Urgently If:

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Key Points for AMC

Sources: Campbell's Operative Orthopaedics 15th Ed 2026; Miller's Review of Orthopaedics 9th Ed; Rosen's Emergency Medicine; POSNA Acute AARS Study Guide