Baby Height & Length Converter

The average birth length for a full-term newborn is about 50 cm (19.7 inches). The normal range spans roughly 47–54 cm (18.5–21.3 inches). Boys tend to be very slightly longer than girls on average.

Divide the value in centimetres by 30.48 to get decimal feet. Take the decimal portion and multiply by 12 for inches. For example, 50 cm ÷ 30.48 = 1.64 ft. The 0.64 ft × 12 = 7.7 inches, so 50 cm ≈ 1 ft 7.7 in (often written as 1'7.7").

Babies grow fastest in the first year — most gain about 25 cm (10 inches) in length. Growth then slows to roughly 12 cm (5 inches) in year two. Growth charts track this against WHO or CDC percentile curves to make sure growth is on track.

No. Recumbent length (lying down) is typically 1–2 cm longer than standing height. WHO growth charts for ages 0–2 use recumbent length; charts for ages 2+ use standing height. This is why you may see a small gap when switching charts at the 2-year mark.

Single measurements are less meaningful than tracking growth over time on a percentile chart. If your baby consistently falls below the 3rd percentile or crosses two major percentile lines downward, discuss it with your pediatrician.