Head
Circumference
First Year
Month |
Normal range (5th to 95th percentile) in cm.
|
Median (50th percentile) in cm.
|
0 |
32.0 - 37.5
|
35.0
|
1 |
34.0 - 39.5
|
37.0
|
2 |
36.0 - 41.5
|
38.5
|
3 |
37.0 - 43.0
|
41.0
|
4 |
38.0 - 44.0
|
42.0
|
5 |
38.5 - 45.0
|
42.5
|
6 |
39.5 - 46.0
|
43.5
|
7 |
40.5 - 46.5
|
44.0
|
8 |
41.0 - 47.0
|
45.0
|
9 |
41.5 - 47.5
|
46.0
|
10 |
42.0 - 48.0
|
46.5
|
11 |
42.5 - 48.5
|
46.5
|
12 |
43.0 - 49.5
|
47.0
|
The Second Year
Month |
Normal range (5th to 95th percentile) in cm.
|
Median (50th percentile) in cm.
|
12 |
43.0 - 49.5
|
47.0
|
14 |
43.5 - 50.0
|
47.5
|
16 |
44.0 - 50.0
|
48.0
|
18 |
44.5 - 50.5
|
48.5
|
20 |
45.0 - 51.0
|
49.0
|
22 |
45.5 - 51.5
|
49.5
|
24 |
46.5 - 51.5
|
49.5
|
The Third Year
Month |
Normal range (5th to 95th percentile) in cm.
|
Median (50th percentile) in cm.
|
24 |
46.5 - 51.5
|
49.5
|
26 |
46.5 - 52.0
|
49.5
|
28 |
46.5 - 52.0
|
50.0
|
30 |
46.5 - 52.0
|
50.0
|
32 |
47.0 - 52.5
|
50.0
|
34 |
47.0 - 52.5
|
50.0
|
36 |
47.0 - 52.5
|
50.0
|
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