This has happened to me. Before I found the fish of fertility, I could go on and see that 1 or 2 of my people had given birth while I was away. Then, I found the fish of fertility and soon upgraded to level 3. The next time I checked, I had 9 nursing mothers! After that, 6, and a while after, 14.
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"Don't cry because it's over. Smile because it happened."