When I look around me, I see mostly women who are alone, left by their husbands after their kids grew up, for a younger woman, which is the most common thing, or suddenly abandoned after getting married and left with young children.
Something struck me in Africa, in black Africa, where polygamy is legal: the solitary woman is the rule there, from at an extremely young age, and the children are always the mother's responsibility.
Adults don't know how to respect and really love their young ones. Often love is confused with possession. You say "this is my" about your child, without taking into account that you're dealing with a real person with his/her own personality, rights, and autonomy, even when very young.
For my whole life I have dedicated myself to those who have been subjected to injustice. I've conducted investigations and written in newspapers about the homeless, the incarcerated, the sick excluded from care, about child labor, child exploitation, etc.
Besides, everywhere, life is getting longer, marriages fall apart, divorce is a reality that happens even where the law doesn't sanction it. It remains the tradition that women are trusted to take care of the children.