Baby Milestones Month by Month (0–12): An AU Developmental Guide

Every baby grows on their own timeline — but knowing the typical Australian developmental milestones from 0–12 months helps you celebrate the wins and spot any flags early. This is your warm, evidence-based, month-by-month guide, written from a Maternal Health Nurse perspective and aligned with current AU child health guidance.

Think of milestones as a range, not a deadline. Most healthy babies hit them within a window of several weeks. Always look at the whole picture — your baby's alertness, feeding, weight gain and connection with you — rather than one tick-box.

How to use this guide

• Domains: we cover motor (gross + fine), social/emotional, communication and cognitive milestones each month.
• Adjust for prematurity until age 2 — use your baby's corrected age.
• Red flags are listed at the end of each stage. One isolated sign is usually nothing — a cluster or regression deserves a chat with your GP or Maternal & Child Health Nurse.

Month 1 — The fourth trimester

Newborns spend most of the day asleep or feeding. Their world is sensory: your voice, your smell, your warmth.

• Motor: Strong rooting and sucking reflexes. Lifts head briefly during tummy time.
• Social: Calms when held; prefers human faces and high-contrast patterns.
• Communication: Cries to communicate hunger, discomfort and tiredness. Decode the cry types here.
• Cognitive: Focuses 20–30 cm away — roughly your face during a feed.

Watch for: floppy or very stiff body, no response to loud sounds, poor feeding, jaundice not fading.

Month 2 — The first social smile

• Motor: Holds head up at 45° during tummy time. Hands often fisted but start to open.
• Social: First true social smile in response to you — one of the most magical milestones.
• Communication: Begins cooing — soft vowel sounds like "ah" and "oo".
• Cognitive: Tracks moving objects across the midline.

Watch for: no smiling by 8 weeks corrected, no eye contact, persistent feeding difficulties.

Month 3 — Hands discovered

• Motor: Lifts head and chest in tummy time. Brings hands to mouth and bats at dangling toys.
• Social: Smiles widely, laughs for the first time, recognises caregivers.
• Communication: Coos in "conversation" — pauses for your reply.
• Cognitive: Studies own hands intently.

Month 4 — Rolling and reaching

• Motor: May roll tummy-to-back. Pushes up on forearms. Reaches purposefully for toys.
• Social: Belly laughs; turns head toward familiar voices.
• Communication: Babbling begins — consonant sounds like "ba" or "da".
• Cognitive: Mouths objects to explore. The famous 4-month sleep regression often hits here as sleep cycles mature.

Watch for: not reaching for objects, head still very wobbly, no babbling sounds.

Month 5 — Strong core, big personality

• Motor: Rolls both ways for some babies. Sits with support.
• Social: Shows clear preferences — for people, toys, songs.
• Communication: Squeals, blows raspberries, mimics tone.
• Cognitive: Reaches for own feet; brings them to mouth.

Month 6 — A whole new world (and solids)

Around 6 months, AU guidance recommends introducing iron-rich first foods alongside continued breast or formula milk. Signs of readiness: stable head control, sitting with minimal support, showing interest in food, and losing the tongue-thrust reflex.

• Motor: Sits tripod-style; rolls confidently both ways; may rock on hands and knees.
• Social: Recognises name; engages in back-and-forth play.
• Communication: Repetitive babbling — "ba-ba-ba", "ma-ma-ma".
• Cognitive: Passes objects between hands; explores textures.

Watch for: not rolling either way, not reaching for objects, no babbling, very limited facial expressions.

Month 7 — On the move (almost)

• Motor: Sits unsupported for short stretches. May commando crawl or scoot.
• Social: Shows stranger awareness — clinginess to primary caregivers is healthy attachment, not a setback.
• Communication: Understands tone — responds differently to friendly vs firm voices.
• Cognitive: Looks for partially hidden objects (early object permanence).

Month 8 — Pincer grip emerging

• Motor: Sits steadily; many begin crawling. Pulls to stand on furniture.
• Social: Plays peek-a-boo; may show separation anxiety.
• Communication: Combines syllables ("dada", "mama") — not always with meaning yet.
• Cognitive: Early pincer grip — picks up cheerios between thumb and forefinger.

Month 9 — Curiosity overload

• Motor: Crawls efficiently; cruises along furniture.
• Social: Waves bye-bye; copies actions like clapping.
• Communication: Understands "no"; responds to own name reliably.
• Cognitive: Looks for fully hidden objects — object permanence consolidating.

Watch for: not bearing weight on legs when held standing, no babbling, doesn't recognise familiar faces.

Month 10 — Standing tall

• Motor: Stands holding furniture; may take steps along it. Lowers from standing safely.
• Social: Plays interactive games; shows affection with cuddles.
• Communication: Says "mama" and "dada" with meaning. Understands simple requests.
• Cognitive: Drops objects deliberately to watch them fall — testing cause and effect.

Month 11 — Words and walking on the horizon

• Motor: Stands alone briefly; takes a step or two with hands held.
• Social: Shows clear preferences for people and toys.
• Communication: 1–2 clear words beyond mama/dada. Points at objects of interest.
• Cognitive: Imitates simple actions — brushing hair, holding a phone to ear.

Month 12 — The first birthday

• Motor: Many take first independent steps between 9–18 months — anywhere in that window is normal.
• Social: Hands you a book to read; gives kisses and cuddles on request.
• Communication: Uses 2–6 clear words; understands far more.
• Cognitive: Bangs objects together; follows simple one-step instructions like "give me the ball".

Watch for: not pulling to stand, no clear words, no gestures (pointing, waving), loss of skills previously gained.

The big 12-month red flags worth a same-week check

Speak with your GP or Maternal & Child Health Nurse if at 12 months your baby:

• Isn't bearing weight on their legs when supported.
• Doesn't babble or use any consonant sounds.
• Doesn't respond to their name or familiar voices.
• Doesn't make eye contact or share smiles.
• Has lost any skill they previously had (regression is always worth assessing).

Early support — through the AU National Disability Insurance Scheme (NDIS) Early Childhood Approach if needed — works best when started early. Asking a question is never overreacting.

How to support development at home (no flashcards required)

• Tummy time from day one — short and often. Builds the core for rolling, sitting and crawling.
• Talk constantly — narrate your day. Babies learn language from the back-and-forth, not screens.
• Read aloud daily — even 5 minutes. Books build vocabulary years before first words.
• Floor play — let your baby move freely on a safe mat. Avoid long stretches in bouncers or jumpers.
• Respond warmly to cries and cues — responsive parenting wires the brain for secure attachment.

Sleep and milestones — the link parents miss

Big motor leaps (rolling, crawling, pulling to stand) almost always disrupt sleep for 1–2 weeks. Your baby practises new skills at 2am — it's normal, not a setback. Keep your settling approach consistent and the regression passes.

Track every milestone in one place

Our Baby Development Milestone Guide gives you a free, age-personalised tracker — log first smiles, first rolls and first words as they happen. Pair it with the Precious Five Memory Book to keep the moments forever.

This guide reflects current Australian child health information and the lived experience of Maternal Health Nurses. It is not a substitute for personal medical advice. If you ever feel unsure, contact your GP, MCHN, or call 1800 022 222 (Healthdirect) 24/7.

Premature babies: using corrected age for milestones

Premature babies: using corrected age for milestones

If your baby was born before 37 weeks, use their corrected age when considering developmental milestones. Corrected age allows for the weeks of pregnancy your baby missed and generally gives a fairer picture of development until around 2 years of age.

How to calculate corrected age

Start with your baby’s actual age, counted from their birth date. Subtract the number of weeks they were born before 40 weeks.

For example, a baby born at 32 weeks was 8 weeks early. When they are 6 months old by birth date, their corrected age is about 4 months. You would compare their development with the 4-month milestones in this guide, while remembering that milestones occur across a range.

Corrected age versus actual age

• Development: Use corrected age for skills such as smiling, reaching, sitting, babbling, crawling and walking, usually until about age 2.
• Immunisations: These are generally given according to actual age, not corrected age, including for babies born prematurely. Follow the Australian National Immunisation Program schedule and your child’s clinical advice.
• Growth: Your healthcare team may use premature-baby growth charts or adjust for prematurity. Growth should be interpreted alongside feeding, health history and the pattern over time.

Premature babies do not all develop in the same way. Their progress may also be influenced by how early they arrived, their health after birth and their individual temperament. Focus on emerging skills and connection rather than comparing your baby with another child.

When to seek advice

Contact your Maternal and Child Health Nurse, midwife or GP if your baby is not making developmental progress using corrected age, has feeding or growth difficulties, seems unusually floppy or stiff, responds little to sounds or faces, or you have any concern. Do not wait for the next routine check if your instincts tell you something is different. Seek prompt medical assessment for any loss of previously acquired skills. Call Triple Zero (000) if your baby is unresponsive, has severe breathing difficulty, turns blue or has a seizure.