Well, today I sat down on one of them, holding Kibi in my lap (he was being soooooo fussy about eating lunch today I decided to take matters into my own hands and spoon feed him from my own chair) ... and IT BROKE. We went crashing to the floor, and amazingly in the split second in which I realized it was happening I was able to cushion K's head with my arm to prevent it from falling back, SMACK, on our hardwood floor. We were both fine but he was a little spooked. (Poor little guy... he was quiet at first, and then, when I got up and hauled the chair out to the garbage can outside, I heard him inside bursting into tears.)
I read the bottom of the chair and it said: MAXIMUM WEIGHT ALLOWED: 160 LBS. Well, NOW you tell us!
My only consolation: thank goodness it took two of us (and not me alone) to break the dang thing.
I guess we're going chair shopping this weekend....