They do go through a lot of growth spurts, but they have 5 distinct cries or sound that tell you what is wrong and only one means hungry. One means tired, wet or dirty, needs to burp and bored I think is the last one. This is in a book, tested out to be true and was on Oprah twice. I wish I knew them and could tell you, but you might could google to find it.
Be sure you are not eating any dairy such as milk, yogurt, cheese, etc. until you find if he is intollerant to milk products as most babies are. A mother's milk is the only milk intened for all of us. That is why you find thousands that are lactose intollerant and have cramps, stomachache, diareah and headaches from dairy. Also brocoli and beans.
Soy or rice milk and soy products are great. Even soy ice cream. This is temporary and you can eat them again when you wean him.
Be sure and nurse on one side the longest to get the hind milk which is where the fat is. The front milk will be thinner and sometimes look like skim milk or bluer in color. Then begin on the other breast next time. This is help from La Latche League. You can call them and they are wonderful 24/7 with any help you need.
V. B.