This traditional chart supposedly will predict the gender of your child, providing you know the mothers age (at conception) and the month conception takes place. There are no guarantees, of course, but I can say that it is absolutely accurate for my family (for 3 generations) and for several other families I know of.  If you're a non-believer, try it out with your children that are already born.

Of course, modern technology has made the chart unnecessary, but it's still fun.  Think about it - how does it know?

Age	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
18	Girl	Boy	Girl	Boy	Boy	Boy	Boy	Boy	Boy	Boy	Boy	Boy
19	Boy	Girl	Boy	Girl	Girl	Boy	Boy	Girl	Boy	Boy	Girl	Girl
20	Girl	Boy	Girl	Boy	Boy	Boy	Boy	Boy	Boy	Girl	Boy	Boy
21	Boy	Girl	Girl	Girl	Girl	Girl	Girl	Girl	Girl	Girl	Girl	Girl
22	Girl	Boy	Boy	Girl	Boy	Girl	Girl	Boy	Girl	Girl	Girl	Girl
23	Boy	Boy	Boy	Girl	Boy	Boy	Girl	Girl	Girl	Boy	Boy	Girl
24	Boy	Girl	Girl	Boy	Boy	Girl	Boy	Girl	Boy	Boy	Girl	Boy
25	Girl	Boy	Girl	Boy	Girl	Boy	Girl	Boy	Girl	Boy	Boy	Boy
26	Boy	Boy	Boy	Boy	Boy	Girl	Boy	Girl	Girl	Boy	Girl	Girl
27	Girl	Girl	Boy	Boy	Girl	Boy	Girl	Girl	Boy	Girl	Boy	Boy
28	Boy	Boy	Boy	Girl	Girl	Boy	Girl	Boy	Girl	Girl	Boy	Girl
29	Girl	Boy	Girl	Girl	Boy	Girl	Boy	Boy	Girl	Boy	Girl	Girl
30	Boy	Boy	Girl	Boy	Girl	Boy	Boy	Boy	Boy	Boy	Boy	Boy
31	Boy	Boy	Boy	Boy	Girl	Girl	Boy	Girl	Boy	Girl	Girl	Girl
32	Boy	Girl	Girl	Boy	Girl	Boy	Boy	Girl	Boy	Boy	Girl	Boy
33	Girl	Boy	Boy	Girl	Girl	Boy	Girl	Boy	Girl	Boy	Boy	Girl
34	Boy	Boy	Girl	Girl	Boy	Girl	Boy	Boy	Girl	Boy	Girl	Girl
35	Boy	Girl	Boy	Girl	Boy	Girl	Boy	Girl	Boy	Boy	Girl	Boy
36	Boy	Girl	Boy	Boy	Boy	Girl	Boy	Boy	Girl	Girl	Girl	Girl
37	Girl	Girl	Boy	Girl	Girl	Girl	Boy	Girl	Girl	Boy	Boy	Boy
38	Boy	Boy	Girl	Girl	Boy	Girl	Girl	Boy	Girl	Girl	Boy	Girl
39	Girl	Girl	Boy	Girl	Girl	Girl	Boy	Girl	Boy	Boy	Girl	Boy
40	Boy	Boy	Boy	Girl	Boy	Girl	Boy	Girl	Boy	Girl	Girl	Boy
41	Girl	Girl	Boy	Girl	Boy	Boy	Girl	Girl	Boy	Girl	Boy	Girl
42	Boy	Girl	Girl	Boy	Boy	Boy	Boy	Boy	Girl	Boy	Girl	Boy
43	Girl	Boy	Girl	Girl	Boy	Boy	Boy	Girl	Girl	Girl	Boy	Boy
44	Boy	Girl	Girl	Girl	Boy	Girl	Boy	Boy	Girl	Boy	Girl	Boy
45	Girl	Boy	Girl	Boy	Girl	Girl	Boy	Girl	Boy	Girl	Boy	Girl