Baby timeline
Your baby at 1 month
One-month-olds are more responsive by the day — longer alert stretches, early focus on faces, sometimes the first hints of a social smile. The 4-week Maternal & Child Health visit falls around now.
What you might notice
1 month
- May start social smiling
- Follows objects briefly with eyes
- More head control during tummy time
- Recognises primary caregivers
Typical weights at this age
| Typically around | Most are between | |
|---|---|---|
| Girls | 4.1 kg | 3.1–5.3 kg |
| Boys | 4.4 kg | 3.4–5.6 kg |
Ranges are the WHO Child Growth Standards typical range (3rd–97th centile) at this age. Babies born early are tracked by corrected age. Weights vary — your MCH nurse tracks your baby’s own curve, which matters more than any single number.
Trusted resources
Your baby’s own timeline
Enter a birth date on the timeline tool to see milestones tuned to your baby — including corrected age for babies born early — and take the whole first 18 months with you as calendar reminders.
Open the baby timelineGeneral information only, aligned with Raising Children Network and green book developmental guidance. Babies vary, and corrected age applies for babies born early.
Concerns about your baby? Start with your MCH nurse (MCH Line 13 22 29) or your GP. For 24-hour nurse advice: NURSE-ON-CALL 1300 60 60 24.
In an emergency call 000. Last reviewed 2026-08-25.