We have the kind that straps to a regular chair. Lately DS has been arching his back and throwing a fit whenever we try to put him in it (he's 10 months old). I've had some luck distracting him first, but it's kind of getting annoying.
DS does this sometimes, I think he just wants to play some much now that he is walking he hates it. I take him out hold him while feeding him so he realizes he wants to eat then try putting him back in and it usually works.
Re: All of a sudden he hates the highchair