Physical Specifications
| Age | Average length/height (cm) |
Length growth | Average weight | Weight gain | Respiration rate (per minute) |
Normal body temperature | Heart rate (pulse) (per minute) |
Visual acuity (Snellen chart) |
|---|---|---|---|---|---|---|---|---|
| 1–4 months | 50–70 cm (20–28 in) | 2.5 cm (0.98 in) per month | 4–8 kg (8.8–18 lb) | 100–200 g per week | 30 to 40 | 35.7–37.5 °C | ||
| 4–8 months | 70–75 cm (28–30 in) | 1.3 cm (0.51 in) per month | (doubling birth weight) | 500 g per month | 25 to 50 | body temperature | heart rate | |
| 8–12 months | Approx. 1.5 times birth length by first birthday | 9.6 kg (21 lb) Nearly triple the birth weight by first birthday |
500 g per month | 20 to 45 | body temperature | heart rate | 20/100 | |
| 12–24 months | 80–90 cm (31–35 in) | 5–8 cm (2.0–3.1 in) per year | 9–13 kg (20–29 lb) | 130–250 g per month | 22 to 40 | body temperature | 80 to 110 | 20/60 |
| 2 years | 85–95 cm (33–37 in) | 7–13 cm (2.8–5.1 in) per year | 12–15 kg (26–33 lb) about 4 times birth weight |
1 kg per year | 20 to 35 | body temperature | heart rate |
Read more about this topic: Child Development Stages
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