Developmental milestones paediatrics
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Developmental Milestones in Paediatrics
Developmental assessment is based on the premise that milestone acquisition occurs at a specific rate, in an orderly and sequential manner. Milestones span four core domains: Motor (gross and fine), Language/Communication, Cognitive (problem-solving, learning), and Social/Emotional.
Primitive Reflexes (Birth)
Present at birth and must disappear on schedule - persistence is a red flag.
| Reflex | Disappears |
|---|---|
| Moro (startle) - arms abduct/extend when head drops | ~4 months |
| Grasp reflex | ~4 months |
| Tonic neck reflex ("fencing") | ~4 months |
| Babinski (plantar) | ~12 months |
| Rooting, sucking | Integrated ~4 months |
Milestone Table by Age
2 Months
| Domain | Milestones |
|---|---|
| Social/Emotional | Calms when picked up or spoken to; smiles in response to face |
| Language | Makes sounds other than crying; reacts to loud sounds |
| Cognitive | Watches you move; looks at a toy for several seconds |
| Motor | Holds head up while on tummy; opens hands briefly; moves all four limbs |
4 Months
| Domain | Milestones |
|---|---|
| Social/Emotional | Smiles spontaneously to get attention; chuckles (not full laugh) |
| Language | Cooing sounds ("ooo", "aahh"); turns head toward voice; responds to speech |
| Cognitive | Opens mouth when sees breast/bottle; looks at hands with interest |
| Motor | Holds head steady when held; holds toy when placed in hand; pushes onto elbows when prone; brings hands to mouth |
6 Months
| Domain | Milestones |
|---|---|
| Social/Emotional | Recognises familiar people; laughs; looks at self in mirror |
| Language | Takes turns making sounds with caregiver; blows raspberries |
| Cognitive | Puts things in mouth; reaches for objects; closes lips to indicate "no more" |
| Motor | Rolls from tummy to back; sits with support; pushes up on straight arms when prone; leans on hands for support |
9 Months
| Domain | Milestones |
|---|---|
| Social/Emotional | Stranger/separation anxiety begins; shy with strangers |
| Language | Makes different sounds ("mamama", "bababa"); lifts arms to be picked up |
| Cognitive | Looks for objects when dropped; bangs two objects together |
| Motor | Sits without support; crawls; pulls to stand (some); picks up small objects with a raking grasp |
12 Months
| Domain | Milestones |
|---|---|
| Social/Emotional | Plays pat-a-cake; waves bye-bye |
| Language | Says "mama/dada" with intent; understands "no"; 1-2 words other than mama/dada (some) |
| Cognitive | Puts objects into containers; object permanence - looks for hidden toy |
| Motor | Pulls to stand; cruises along furniture; some take first steps; pincer grasp (thumb + index finger) |
15 Months
| Domain | Milestones |
|---|---|
| Social/Emotional | Copies other children; shows affection; hugs stuffed toys; shows you objects they like |
| Language | 1-2 words beyond mama/dada; points to ask for things or get help; follows directions with gesture |
| Cognitive | Uses objects correctly (phone, cup, book); stacks 2 blocks |
| Motor | Takes a few steps independently; feeds self finger food |
18 Months
| Domain | Milestones |
|---|---|
| Social/Emotional | Moves away from parent but checks back; points to show interesting things; helps with dressing |
| Language | 3+ words beyond mama/dada; follows 1-step directions without gesture |
| Cognitive | Copies simple chores (sweeping); simple pretend play |
| Motor | Walks independently; scribbles; climbs onto couch/chair; tries to use spoon |
24 Months (2 Years)
| Domain | Milestones |
|---|---|
| Social/Emotional | Notices others hurt/upset; looks to parent for cues in new situations |
| Language | Points to pictures in book when asked; 2-word phrases ("more milk"); names 2 body parts |
| Cognitive | Holds something in one hand while using the other; plays with 2 toys at once |
| Motor | Runs; kicks a ball; climbs; 50 recognisable words in vocabulary |
Toilet training: Daytime urinary control usually complete by 2.5 years; night-time continence by 4 years.
30 Months (2.5 Years)
| Domain | Milestones |
|---|---|
| Social/Emotional | Plays alongside others; "parallel play" |
| Language | 2-3 word sentences; uses pronouns (I, me) |
| Cognitive | Names some colours; completes simple puzzles |
| Motor | Jumps with both feet; turns book pages one at a time |
3 Years
| Domain | Milestones |
|---|---|
| Social/Emotional | Takes turns; plays with other children (cooperative play begins); expresses love/jealousy/envy |
| Language | 3-word sentences; strangers can understand speech ~75%; asks "why?" frequently |
| Cognitive | Counts to 3; draws a circle; undresses self; knows own name/age/sex |
| Motor | Pedals tricycle; runs well; hops on preferred foot |
4 Years
| Domain | Milestones |
|---|---|
| Social/Emotional | Pretend/dramatic play; concern for others; sharing improves; "Band-Aid phase" (preoccupied with bodily injury) |
| Language | Strangers understand most speech; tells stories; uses sentences of 4-5 words |
| Cognitive | Names some colours/letters; draws a person with 3 parts; understands "same/different" |
| Motor | Catches a bounced ball; hops on one foot; can dress/undress with minimal help |
5 Years
| Domain | Milestones |
|---|---|
| Social/Emotional | Follows rules in games; performs for others (sings/dances); does simple chores |
| Language | Tells a story with at least 2 events; maintains conversation (3+ exchanges); uses simple rhymes |
| Cognitive | Counts to 10; names numbers 1-5; writes some letters; uses words about time ("yesterday/tomorrow"); pays attention for 5-10 minutes |
| Motor | Hops on one foot; buttons clothes |
School-Age (6-12 Years)
- Logical thinking dominates over fantasy; ability to concentrate well established by age 9-10
- Abstract thinking begins to emerge by end of period
- Best friend relationships form (Harry Stack Sullivan: necessary for healthy psychological development)
- Moral development: until ~7 years, rules seen as absolute ("immanent justice")
- Complex motor tasks (sports, gymnastics, writing fluently) achieved
- Same-sex peer groups predominate
- Gender identity is usually fixed by 24-30 months and is largely innate
Key "Red Flags" - When to Worry
(Harriet Lane Handbook, 23rd ed.)
At any age: Loss of previously acquired skills is always a red flag - refer immediately.
| Age | Red Flag |
|---|---|
| 2 months | Not responding to loud sounds; not watching things that move; not smiling at people |
| 4 months | Does not bring objects to mouth; does not push down with legs when feet placed on hard surface |
| 6 months | No babbling; cannot sit with support |
| 9 months | No back-and-forth gestures (pointing, waving) |
| 12 months | No babbling; no gestures (pointing/waving); no single words by 16 months |
| 18 months | No single words; no pointing |
| 24 months | No 2-word meaningful phrases (without imitating); no pointing to pictures |
| Any age | Regression - losing language or social skills previously gained |
Developmental Screening Tools
| Tool | Age Range | Completed by |
|---|---|---|
| Ages and Stages Questionnaire (ASQ) | 4-60 months | Parent |
| Parents' Evaluation of Developmental Status (PEDS) | 0-8 years | Parent |
| Capute Scales (CLAMS + CAT) | 3-36 months | Clinician |
| M-CHAT-R/F (autism screen) | 16-30 months | Parent |
| CSBS DP Infant-Toddler Checklist (autism) | 6-24 months | Parent |
AAP guidelines: Formal developmental screening at 9, 18, and 30 months (or 24 months if 30-month visit not possible). Autism-specific screening at 18 and 24 months.
Mnemonic Aids
- No social smile by 6 weeks - refer
- "2 words by 2 years" - a common bedside rule (2-word phrases by age 2)
- "Words by 12 months" - at least mama/dada with intent
- Pincer grasp by 9-10 months
- Walking independently by 18 months (if not, evaluate for motor delay)
- Speech intelligibility: 50% at 2 years → 75% at 3 years → 100% at 4 years
Sources: The Harriet Lane Handbook (Johns Hopkins Hospital, 23rd ed.); Kaplan and Sadock's Synopsis of Psychiatry; CDC Developmental Milestones (reviewed Dec. 2022)
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Developmental Milestones Quick Reference
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What's inside the PDF:
-
Colour-coded milestone table for every age checkpoint from 2 months through school age (12 ages total), with 4 columns per age:
- 🔵 Motor (gross + fine)
- 🟢 Language/Communication
- 🟣 Cognitive (problem-solving)
- 🟠 Social/Emotional
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Red Flags table - age-specific warning signs requiring immediate referral, highlighted in red
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Clinical Pearls & Mnemonics - quick bedside rules (speech intelligibility progression, continence ages, gender identity, screening schedule)
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Developmental Screening Tools table - ASQ, PEDS, Capute Scales, M-CHAT-R/F, CSBS DP with age ranges
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Running header + footer on every page citing Harriet Lane Handbook 23rd ed., Kaplan & Sadock, and CDC Milestones 2022
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