Don't bother ! Absolutely not worth it. 
Just gave up trying to put ONE together.  They reek, it's a very chemical smell.
More importantly, the "tool" provided is insufficient to get the screws in - if you don't get the screws in enough, the stool will be wobbly.  
Can't do it with bare hand, it's too painful as it's a tiny little allen wrench you have to turn. 
The seat is very narrow, so they may not even be comfortable for an adult. 
Won't bother trying to send these back, as it's impossible to re-package.  So , this was a total waste of $$.  This is the first purchase I have been unhappy with.