First of all, you need to understand that true milk does not come in until after a few days. The common misconception and downfall to breastfeeding is to think that you have milk IMMEDIATELY after delivery - we humans are not like machines, press a button and milk will come out. It takes time and the human baby is designed to take small amounts of milk - that is why in the last trimester of a pregnancy, a baby packs on A LOT of weight in the form of fats to help him/her tide the first week of just taking in small amounts of colostrum.
Until then, your wife has been feeding your baby colostrum which is more important and way way better than those stupid formulas in the market. Your baby's tummy is the size of her fist and so she doesn't need a lot to keep her satisfied. All you need to do right now - what is more important - is to STOP formula feeding and latch on often to stimulate milk production (as often as once every two hours).
When babies cry, especially young ones, it doesn't always mean that they are hungry. It could be discomfort, insecurity and so forth. In the meantime, get your wife to eat well, drink lots of liquids (papaya and fish soup helps) and oh, avoid cabbages as they can affect breastmilk supply.