Ah, breast-feeding. Two things are for sure: it’s still causing controversy, and moms are still failing to nurse for as long as they intended to. Just 1% of them said they intended to breast-feed exclusively — giving no formula — for less than a month, but 42% stopped within that first month, according to research published in June in Pediatrics. Then there’s the other extreme: TIME’s cover image of a model-looking mom breast-feeding her preschool-age son generated a flurry of excitement over how long is too long to breast-feed. Naysayers, stand down: the American Academy of Pediatrics sets no upper limit.