Baby growth standards (weight, length, head circumference) from 0–12 months follow the WHO child growth standards used worldwide. Tracking isn’t about hitting a “perfect” number — it’s about the trend: is your baby growing along a steady curve over time?

Why growth charts matter

Each child grows at their own pace, but a consistent upward trend signals that feeding, digestion, and neurological development are on track. A flat or dropping curve, or an unusual spike, may indicate a nutritional gap, an infection, or something else worth checking.

Average weight by age

  • Birth: 3.0–3.5 kg (7–8 lb).
  • 1 month: 4.0–5.0 kg (gain ~150–200 g/week).
  • 3 months: 5.5–6.5 kg.
  • 6 months: 7.0–9.0 kg (as solids are introduced).
  • 9 months: 8.5–10.0 kg.
  • 12 months: 9.0–11.0 kg (roughly 2–3× birth weight).

Weight can dip in the first couple of days (mild dehydration) then recover within the first week. This is normal.

Length / height

  • Birth: about 48–52 cm.
  • 3 months: 59–63 cm.
  • 6 months: 65–70 cm.
  • 9 months: 70–75 cm (around when crawling begins).
  • 12 months: 74–82 cm (and ready to walk).

Head circumference (OFC)

The brain grows fastest in the first 4 months, making OFC an important neurological marker.

  • Birth: 33–35 cm.
  • 3 months: 39–41 cm.
  • 6 months: 43–45 cm.
  • 9 months: 45–47 cm.
  • 12 months: 46–48 cm.

A quickly growing (“large-headed”) or slow-growing head can signal neurological issues; follow up with your pediatrician.

When to call the pediatrician

  • Weight dropping for over two weeks straight.
  • Head circumference falling well below the expected curve.
  • Measurements far outside the age range (below the 3rd or above the 97th percentile).
  • A sharp change in growth pattern after 6 months.

Practical tips

  • Weigh and measure at a health facility (community health center), not at home.
  • Keep a record at every visit — on paper or in your preferred tracker. What matters is a consistent record you can spot a trend in.
  • Focus on direction, not a single number.

Routine monitoring plus plenty of love is the best combination for a healthy, confident child.