My 6month old son is constantly wanting to eat. So I'll put him on the breast and he will eat and then unlatch, stare at me for a minute, latch again, repeat over and over again. Sometimes he even stops and sucks on his fingers.. what could thjs mean? Low milk supply?

Or him just being bored & wanting to suck on anything? My breasts don't feel as full as they once used to and I'm not sure what's happened. Please help