My baby is 5 weeks old and just started spitting up a few days ago. I think he may have had little spit ups before, but almost nothing that would go beyond his mouth. Now it's happening every day. He seems happy afterwards and not bothered, so I don't think he's sick. And I haven't been doing anything different. Still feeding on demand, but it seems like he is getting too much in his tummy? I think this is normal baby behavior, but I'm scared to overfeed him if it's going to come back up. And I find it weird that he wasn't spitting up before and now all of a sudden, it seems to have become a regular occurance?