A lot of times new parents aren't aware of the connection between what Mom eats and how Baby feels. There's a very direct link here. If my wife eats some garlic or something, there's a great chance we're going to spend the night/day wondering why our usually calm baby is so upset all the time (until we remember yesterday's meal anyway).
If you Google "food colic baby" or something like that, you'll pull up a lot more sights like this one which lists some of the most common no-no foods if you want to have avoid the world of colicy discomfort for your baby.
Link: Colic and Breastfeeding - Colic Help.
Many times, colic in a breastfed baby can be traced to something in the mothers's diet.
The worst dietary offender is cow's milk.