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 voice…