2021 Update: We have thrown these out and replaced them with solid wood chairs through a local furniture shop.  Only 3 of the 6 we purchased made it to 12 months....1 of the chairs that broke was used by my 40 lb 6-year-old. (who sat in it properly)
Purchased in December, one of the chair legs broke in February...of course, I'm outside of the return window.  Either be very gentle with these or purchase something else.