help! 7mths and refusing bottle

I just started my baby on some solid ( cereal, puree) a month ago. These few weeks, he has been refusing to drink his milk (ebm) from his bottles. I tried changing teats, increasing the flow, different brand, switching to formula, using freshly ebm instead of frozen ones, getting others to feed, feed in a dark room, etc. Nothing works! He still nurses normally and eats his solid but just plainly refuse to drink from the bottle. Helpppppp