Term

Biometrics (mm)

Bi-parietal diameter

17 WA + 2

36.5

24 WA + 5

60.6

30 WA + 5

77.8

Cephalic perimeter

139.6

227.3

279.8

Abdominal perimeter

120.1

194.1

258.7

Femoral length

26.3

44.1

51.8

Estimated foetal weight (gr)

209

687

1538