My tribe started with only one female, and she kept producing boys. I was really worried, but finally a girl child was born - whew!

The tribe is now 81 villagers and sex ratios are normal...

About baby boom: at one point I made the mistake of having about 10 babies all at once. Algae covered the ocean. The strain on the food supply was major and I didn't dare do more babies for quite a while. So there was a gap of 14 years in the ages. The old folks died and there were no babies to find the collectibles, and all the ladies were either too young or too old and it was a mess.