| 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 (8.8–17.6 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,[MISSING],Body temperature,Heart rate, |
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