Colic seems to get worse as the day progresses. Your baby may cry for hours, for no apparent reason. Usually they stiffen up their legs, pulling them up to their belly as if they are uncomfortable. They may pass gas. Colic may occur after meals compared to the hungry baby who cries before being fed.
Most colicky babies are good feeders with normal monthly weight gains.
However, during a colic fit, they may refuse to eat or nurse until they calm down. Do not take this as a rejection. This is a difficult time for you and your baby. It is important to provide comfort during these uncomfortable times. In my experience, babies that are comforted when in pain, develop into happier babies.