Why does my 2 month old pull her legs up when i feed her?

my 2 month old daughter likes to pull her legs up to her stomach when i feed her. Now, i only feed her 3 ounces every 3-4 hours. She sleeps very well sometimes the whole night (11pm-6am) she does not spit up much and the doctor says she is having normal bowel movements, (usually once a day or every other day) What could this be? Is This colic?