You can't buy diapers with food stamps or get them through WIC (Women, Infants, and Children) 22% of children under 5 years old in United States live in poverty and 1 out of every 3 families struggle to afford diapers. Diapers cost an average of $75-$100 per month and that's a lot of dough to drop for the 4.2 million people living in poverty in the United States. If a family can't afford diapers, a baby may spend extended periods of time in the same soiled diaper.