I like the original zodiacal affinity list of fertile/mixed/barren signs in the "Astronomica" (Manilius, 14 AD), as modified by consideration of the modern insights of Charles Carter and H.L. Cornell regarding this mattter; I use the following numerical allocations (+ = favoring fertility/childbirth and -= the opposite influence)
+2: Cancer Scorpio Pisces
+1: Taurus Gemini Sagittarius
-1: Aries Libra Capricorn
-2: Virgo Aquarius Leo
I also use traditional fertility/mixed/barren planetary allocations, again as modified (with the addition of the outers) by Carter and Cornell:
+ = Moon Venus Jupiter (Jupiter might be given a double + estimation) Neptune
- = Sun Mars Saturn Uranus Pluto
0 (mixed influence; alternating influence) = Mercury