Weeks of gestation:
6-9            0-12
10-12        10-30
13-15        13-60
16-18        16-93
19-21        32-139
22-24        56-224
25-27        96-357
28-30       135-435
31-33       141-423
34-36       121-379
37-40         93-320

<5.8

=< 6.90