Shifting to one child families would get the human population down to a sustainable level in a couple of generations -- especially if less consumptive lifestyles are also pursued. So that children can experience having 'siblings', families can band together in communities so that kids have 'soul siblings' to play and grow with.
My heroes are the men who have chosen to have vasectomies after producing that one child, and the men and women who adopt war orphans and others in need of a family.
Dead babies are mostly caused by an over-exploited earth -- and the resulting wars, climate change, water shortages, pollution, etc. People choosing smaller families and adoption is what saves babies.