Sleep Issues

My son is 5.5 months old. He used to wake up once a night st about 230 wanting food. Ever since he turned about 4 months old he has been waking up pretty much every 2 hours. I hate to just feed him back to sleep but it's the only thing that works and he goes from about 0-100 in no time. So he gets 3 bottles throughout the night, sometimes he just has half at one wakeup and the other half when he inevitably wakes up again.

He sleeps in a bassinet by our bed but I think he is outgrowing it. He eats PLENTY during the day. He also has to be fed to sleep at night and for his daytime naps. He gets 28-32 oz all day and night.

I don't want to create bad habits. But this mama needs sleep. bad. What am I doing wrong?