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Table 1 The ratio of crown-rump length and height

From: Failure to diagnose hypochondroplasia by prenatal diagnosis: a case report

the moon's age

Birth

1

3

6

9

12

crown-rump length(cm)

33

34.2

36.4

41.2

43.4

45.6

height(cm)

48

49.1

52.7

59.5

62.8

65.5

The ratio of crown-rump length and height

0.688

0.697

0.691

0.692

0.691

0.697