W om an's Age at Conception M onth of Conception
January
18 *
February M arch
19
20
21
*
23
24
*
* *
22
*
*
*
*
*
M ay
*
*
26
*
*
April
25
*
*
*
*
*
*
*
*
*
July
*
*
August
*
Septem ber
*
*
*
*
*
*
*
*
*
*
*
*
*
*
Novem ber
*
*
*
December
*
*
*
*
29
30
31
*
*
* *
* *
June
October
28
*
* *
*
27
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
* *
*
*
*
*
*
23
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