My DS is almost 9 weeks old and I've noticed that he spits up quite a bit when I am interacting with him or if he's had a good kicking session in his bouncer (he has lights and play). Often happens over an hour after feeding. I'm wondering if this is normal, and if he it is just spit up or real vomit (seems about half an ounce of milk comes up but it's hard to tell and never projectile). I wouldn't say he's a sicky baby although he is a windy one. I've had him on infacol since 2 weeks and i wonder if he's got too used to it. He's a big boy too 12lbs.