http://www.fns.usda.gov/wic/
W.I.C. (Women, Infants, and Children) is a federal program designed to help pregnant/nursing mothers, and children 0-5 get a nutritional supplement to their diet. They offer same day appointments in most states, and your vouchers are given to you the day of your appointment. You'll need to have proof of income, child's birth, and something to verify your address (a bill). The first appointment is generally an hour, but pick ups are once every three months and generally take 15-30 minutes, with re-certs taking 30-60 minutes. They are well worth checking out to provide something extra. The website will provide you a list of the WIC offices near you.
http://www.fns.usda.gov/wic/howtoapply/incomeguidelines.htm
This specifically is the income guideline that most people wonder about, thinking they won't qualify. A family of 4 can make up to 39,200 a year! So, don't think you won't qualify.