What you're suggesting is obviously the pragmatic choice - obviously, if she's poor as shit and can't afford regular diapers, using reusable cloth ones is a great solution. But that's not the fucking point of the article - its $CURRENT_YEAR in the richest country in the world, this absolutely shouldn't be a thing that happens in the first place.
I'm not even a communist or anything, but its absolutely insane to me that Americans don't realize how "third world" their country is in some ways. Do you think that back in the 50s and 60s when your parents or grandparents were buying the first mass produced disposable diapers, they would have expected 60 years later people would be forced to go back to washable cloth diapers because they couldn't afford regular diapers? What a stupidly low standard to have for the wealthiest country in the world.
Capitalism is an awesome thing, but it seems conservative pundits and the rich have convinced a lot of people that you can't have both a strong, capitalist free market economy along with a government that actually gives a shit about its citizens and not just the top 10,000 guys with the biggest wallets or whatever.