Colic or not?

my ds is 6 weeks and very fussy all of the sudden the past few days .. especially at night.. nothing will help but a bottle i mean its unusually often like every hour he wants 4 ozs again when its usually every four.. is it colic or just wanting food .. cause he cries not to long after eating? he is usually not a loud crier now its very shrill .. and it seems like he could be in pain .. from it?