Looking at your other posts is he about 6mo now?
There is a huge growth spurt at 6mo, could he be going through that?
When and where are you trying to feed him? I always found my DS1 would feed better still in the darkened nursery in quiet so that he didn't get distracted.
How does he go to sleep? Independently? If he is feeding to sleep that can mean he doesn't take a full feed and is hungry again sooner. Feeding to sleep can also mean he needs to feed every time he wakes at night as he cannot self-settle.