How many diapers are used in the United States each year?

I'll estimate how many children are in diapers and multiply by how many they use a day. There are about 4 million babies born in the US each year. That's 330 million people divided by a lifespan of about 80, which gives the number of people at each age. Kids wear diapers until they're about two and a half, so that's 10 million children in diapers. Some are done at two and some at three, so two and a half is a middle. I'll say each one uses about 6 diapers a day, which is 60 million a day. A newborn goes through 10 or more and a two-year-old maybe 4, so 6 is an average across the whole period. Times 365, that's about 22 billion diapers a year. That number seems reasonable to me.

I'll estimate how many children are in diapers and multiply by how many they use a day. I'll do babies first and come back to adults at the end. There are about 4 million babies born in the US each year. That's 330 million people divided by a lifespan of about 80, which gives the number of people at each age. Kids wear diapers until they're about two and a half, so that's 10 million children in diapers. Some are done at two and some at three, so two and a half is a middle. I'll say each one uses about 6 diapers a day, which is 60 million a day. A newborn goes through 10 or more and a two-year-old maybe 4, so 6 is an average across the whole period. Times 365, that's about 22 billion diapers a year. For adults, I'll assume about 5 million people use them, mostly elderly, at around 3 a day. That's 15 million a day, or about 5.5 billion a year. So the total is roughly 27 billion, with babies about 80% of it. As a check on the baby number, 6 a day is about 2,200 diapers a year per child. At around 25 cents each that's $550 a year, which sounds like what a family would spend.