
Reference Manual 65
Age (W)
Growth (cm)
Min (cm) Max (cm) Age (W)
Growth (cm)
Min (cm) Max (cm)
20 18.20 16.70 19.70 35 32.80 31.10 34.70
21 19.40 17.90 21.00 36 33.60 31.80 35.50
22 20.50 19.00 22.20 37 34.20 32.40 36.20
23 21.70 20.10 23.30 38 34.90 33.10 36.80
24 22.80 21.20 24.50 39 35.50 33.70 37.50
25 23.90 22.30 25.60 40 36.10 34.30 38.10
26 24.90 23.30 26.60
Head Circumference (HC) : CHITTY (D)
GA Table
Chitty LS, Altman DG, et al.: Charts of fetal size: 2. Head measurements. Brit. J. Obstetrics and
Gyn Vol 101, 35-43, 1994
HC (cm) GA (wd) Min (wd) Max (wd) HC (cm) GA (wd) Min (wd) Max (wd)
8.00 12w4d 11w3d 13w5d 20.50 22w5d 21w3d 24w2d
8.50 12w6d 11w6d 14w1d 21.00 23w1d 21w5d 24w5d
9.00 13w2d 12w2d 14w4d 21.50 23w4d 22w1d 25w1d
9.50 13w5d 12w4d 15w0d 22.00 24w0d 22w4d 25w5d
10.00 14w1d 13w0d 15w3d 22.50 24w3d 22w6d 26w1d
10.50 14w4d 13w3d 15w5d 23.00 24w6d 23w2d 26w5d
11.00 15w0d 13w6d 16w1d 23.50 25w3d 23w5d 27w1d
11.50 15w3d 14w2d 16w4d 24.00 25w6d 24w1d 27w5d
12.00 15w6d 14w5d 17w0d 24.50 26w2d 24w3d 28w2d
12.50 16w2d 15w1d 17w3d 25.00 26w5d 24w6d 28w6d
HC (cm) GA (wd) Min (wd) Max (wd) HC (cm) GA (wd) Min (wd) Max (wd)
13.00 16w4d 15w4d 17w6d 25.50 27w2d 25w2d 29w3d
13.50 17w0d 15w6d 18w2d 26.00 27w5d 25w5d 30w0d
14.00 17w3d 16w2d 18w5d 26.50 28w2d 26w1d 30w4d
14.50 17w6d 16w5d 19w1d 27.00 28w6d 26w4d 31w2d
15.00 18w2d 17w1d 19w3d 27.50 29w3d 27w0d 32w0d
15.50 18w5d 17w4d 19w6d 28.00 30w0d 27w3d 32w4d
16.00 19w1d 17w6d 20w2d 28.50 30w4d 27w6d 33w3d
16.50 19w3d 18w2d 20w5d 29.00 31w1d 28w3d 34w1d
17.00 19w6d 18w5d 21w1d 29.50 31w5d 28w6d 35w0d
17.50 20w2d 19w1d 21w4d 30.00 32w3d 29w3d 35w6d
18.00 20w5d 19w3d 22w0d 30.50 33w1d 30w0d 36w5d
18.50 21w1d 19w6d 22w3d 31.00 33w6d 30w3d 37w4d
19.00 21w4d 20w2d 22w6d 31.50 34w4d 31w0d 38w4d
19.50 22w0d 20w4d 23w2d 32.00 35w3d 31w5d 39w4d
20.00 22w2d 21w0d 23w5d
Fetal Growth Table
Chitty LS, Altman DG, et al.: Charts of fetal size: 2. Head measurements. Brit. J. Obstetrics and
Gyn Vol 101, 35-43, 1994
Age (W)
Growth (cm)
Min (cm) Max (cm) Age (W)
Growth (cm)
Min (cm) Max (cm)
12 6.81 5.95 7.67 28 26.24 24.90 27.57
13 8.21 7.32 9.10 29 27.17 25.80 28.54
14 9.60 8.68 10.52 30 28.06 26.67 29.46
15 10.96 10.02 11.91 31 28.91 27.49 30.34
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