Actually in most agriculture-based traditional societies, the women often do most of the farming and produce food for the tribe that way. The men engage in activities like hunting. The balance is that the farming is more reliable as a food source but the food is less nutritionally valuable while hunting is unreliable but has higher calorie-nutritional content.

So I definitely agree with everyone who has objected to the female villagers being unable to contribute to village activities while "nursing." That is an unrealistic situation.

If you want actual primary/journal articles backing this up, I can provide them, though I doubt it's really necessary.