reflex
allergies
change in foods you have ate
flu??
I have been there. My 15 month old went through all the testing and she was sick for almost a week and a half.
Not to scare you but I think you need to talk to your Doctor about what is goin on with him.
at 6 weeks old my daughter came down sick with what I thought was just a flu bug. 4 days of getting sick all over the place not wanting to eat. Not really sleeping but she got so exhausted that she ended up falling asleep. I ended up taking her to the ER and she was admitted in to the hospital and had to have an iv for fluids because she was so dehydrated. They kept telling me she had nothing wrong. she just had the flu. When my daughter would get sick she would let it fly across the room!! This was not just the flu.
I demanded that test be ran on her. She did not have relfex she was not allergic to any foods.
I told them from the start that her dad had to have to pyloricstanoisis (sorry about the spelling i don't know if it is correct prob. not) I just call it pyloric surgery. his valve on top of his stomach would not close. With my daughter it was the bottom of her stomach was closed off from her intestines. So her food could not go anywhere but back up.
I am not trying to worry you but Please if you really truely feel that there is something wrong with your child and it is not normal for your son to get sick or come down sick then please take him to the doctor or ER and have him Checked out. Demand it if you have to. I had to and it saved my lil' girls life!
Good luck and I hope you baby boy gets feeling better soon!!!