Baby Boy Height and Length Chart (WHO, 0 to 5 Years)

Length / height chart for boys by month

Values at the 3rd, 15th, 50th (median), 85th and 97th percentiles, calculated from the WHO LMS tables. Switch between cm and in.

Length / height in cm by age, WHO percentiles for boys
Age	3rd	15th	50th	85th	97th
Birth	46.3	47.9	49.9	51.8	53.4
1 month	51.0	52.6	54.7	56.7	58.3
2 months	54.7	56.4	58.4	60.5	62.2
3 months	57.6	59.3	61.4	63.5	65.2
4 months	60.0	61.7	63.9	66.1	67.8
5 months	61.9	63.7	65.9	68.1	69.9
6 months	63.6	65.4	67.6	69.9	71.7
7 months	65.1	66.9	69.2	71.4	73.2
8 months	66.5	68.3	70.6	72.9	74.8
9 months	67.8	69.6	72.0	74.3	76.2
10 months	69.0	70.9	73.3	75.6	77.6
11 months	70.2	72.1	74.5	77.0	78.9
12 months	71.3	73.3	75.7	78.2	80.2
13 months	72.4	74.4	76.9	79.4	81.5
14 months	73.4	75.5	78.0	80.6	82.7
15 months	74.4	76.5	79.2	81.8	83.9
16 months	75.3	77.5	80.2	82.9	85.1
17 months	76.3	78.5	81.2	84.0	86.2
18 months	77.2	79.5	82.3	85.1	87.3
19 months	78.1	80.4	83.2	86.1	88.4
20 months	78.9	81.3	84.2	87.1	89.5
21 months	79.7	82.2	85.1	88.1	90.5
22 months	80.5	83.0	86.1	89.1	91.6
23 months	81.3	83.8	86.9	90.0	92.6
2 years	82.1	84.6	87.8	91.0	93.5
2 years 3 months	83.5	86.3	89.6	93.0	95.7
2 years 6 months	85.5	88.4	91.9	95.5	98.3
2 years 9 months	87.4	90.4	94.1	97.8	100.8
3 years	89.1	92.2	96.1	99.9	103.1
3 years 3 months	90.8	94.0	98.0	102.0	105.2
3 years 6 months	92.4	95.7	99.8	104.0	107.3
3 years 9 months	93.9	97.4	101.6	105.9	109.3
4 years	95.4	99.0	103.3	107.7	111.2
4 years 3 months	96.9	100.5	105.0	109.5	113.1
4 years 6 months	98.4	102.1	106.7	111.3	115.0
4 years 9 months	99.8	103.6	108.3	113.0	116.8
5 years	101.2	105.2	110.0	114.8	118.7

Length / height in in by age, WHO percentiles for boys
Age	3rd	15th	50th	85th	97th
Birth	18.2	18.9	19.6	20.4	21.0
1 month	20.1	20.7	21.5	22.3	23.0
2 months	21.5	22.2	23.0	23.8	24.5
3 months	22.7	23.3	24.2	25.0	25.7
4 months	23.6	24.3	25.2	26.0	26.7
5 months	24.4	25.1	25.9	26.8	27.5
6 months	25.0	25.8	26.6	27.5	28.2
7 months	25.6	26.3	27.2	28.1	28.8
8 months	26.2	26.9	27.8	28.7	29.4
9 months	26.7	27.4	28.3	29.3	30.0
10 months	27.2	27.9	28.8	29.8	30.5
11 months	27.6	28.4	29.3	30.3	31.1
12 months	28.1	28.8	29.8	30.8	31.6
13 months	28.5	29.3	30.3	31.3	32.1
14 months	28.9	29.7	30.7	31.7	32.6
15 months	29.3	30.1	31.2	32.2	33.0
16 months	29.7	30.5	31.6	32.6	33.5
17 months	30.0	30.9	32.0	33.1	33.9
18 months	30.4	31.3	32.4	33.5	34.4
19 months	30.7	31.6	32.8	33.9	34.8
20 months	31.1	32.0	33.2	34.3	35.2
21 months	31.4	32.3	33.5	34.7	35.6
22 months	31.7	32.7	33.9	35.1	36.1
23 months	32.0	33.0	34.2	35.5	36.4
2 years	32.3	33.3	34.6	35.8	36.8
2 years 3 months	32.9	34.0	35.3	36.6	37.7
2 years 6 months	33.7	34.8	36.2	37.6	38.7
2 years 9 months	34.4	35.6	37.0	38.5	39.7
3 years	35.1	36.3	37.8	39.3	40.6
3 years 3 months	35.7	37.0	38.6	40.2	41.4
3 years 6 months	36.4	37.7	39.3	40.9	42.2
3 years 9 months	37.0	38.3	40.0	41.7	43.0
4 years	37.6	39.0	40.7	42.4	43.8
4 years 3 months	38.2	39.6	41.3	43.1	44.5
4 years 6 months	38.7	40.2	42.0	43.8	45.3
4 years 9 months	39.3	40.8	42.6	44.5	46.0
5 years	39.9	41.4	43.3	45.2	46.7

How to read this chart

Find your boy's age on the bottom, then the measurement on the side. Where the two meet tells you his percentile. On the 25th percentile, 25 out of 100 healthy boys the same age measure less and 75 measure more. That is completely normal.

Follow the curve. A boy who keeps to roughly the same line from visit to visit is usually growing well, whatever the line.
Watch for big jumps. Crossing two or more major percentile lines up or down is worth a chat with your doctor.
Look at the whole picture. Weight, length and head size are read together, alongside how he is feeding, sleeping and developing.

How to measure at home

Before 2 years babies are measured lying down (length). From 2 years children are measured standing (height), which reads about 0.7 cm less. The WHO tables switch at 24 months. Read our full guide on how to measure your baby at home.

Other WHO growth charts

Frequently asked questions

What is a normal height for a baby boy?

Anything between the 3rd and 97th percentile on the WHO chart is within the normal range. What matters most is that his measurements follow a similar curve over time.

Is the 50th percentile the goal?

No. The 50th percentile is the middle, not a target. A boy on the 10th or the 90th percentile who stays on that curve is usually growing well.

Which chart should I use for my baby boy?

Most countries use the WHO Child Growth Standards for children from birth to 5 years, including the UK and the US CDC for children under 2. This chart uses those WHO tables.

When should I talk to a doctor about my boy's height?

Talk to your doctor or health visitor if a measurement falls below the 3rd or above the 97th percentile, if it crosses two or more major percentile lines, or any time you are worried.