my son just turned 7 weeks and he has been spitting up a lot lately. I wonder why, he's only on…

Could be what you're eating like dairy or something he might have an intolerance to, or acid reflux, or eating too much at one time.

@ashsloan, I think I'm going to start checking what I'm eating. I have been drinking coke, not much but I catch myself taking sips from my bf

Acid reflux maybe? My daughter had it and we didn't find out until she was 5 months old.