Every traditional community in Africa had this practice. During famine the woman usually left and went to stay with the man with food to feed the young. After famine she came back to her former man with new offspring.
Because if she didn't do that she dies from starvation, all the kids die, the community dies.
It also reduced incest and associated diseases and scattered the seed far and wide.
Halafu unaskia talkers kama @Mimi Huwa Namwaga Ndanii
wakiringia single mother na hawajui hivyo ndio ancestors wake walizaliwa.