Oh ok, if he doesn't seemed bothered by spring up like he's in pain or screaming ayer he spits up he's fine, I've always fed my daughter in front of the pediatrician and I wad concerned with how much and often she spits up and she wad not concerned at all with it
Not necessarily if he spits up its a sign, my daughter is 6 months and still spits up and does not eat to much, if they spit up its cause part of their esophagus isn't Stein enough to close and it just comes back up it will get better when they can sit up, but I'm not exactly sure, I know they go through a growth spurt around 3 weeks, I'm sure he is fine, are you Breast feeding or formula
My son is 3 weeks and has been taking 3 Oz every 2-3 hours since 2 weeks. I thought it was a lot, but his pedi said they go through a few growth spurts and it's fine.