Girls, maybe someone has encountered... A baby is 1.5 months old, his …

Girls, maybe someone has encountered... A baby is 1.5 months old, his belly button sticks out really bad, and if you touch it, it feels like there's air in there. I'm very scared because even though the baby is behaving calmly, when I touch the belly button, I get scared. We're going to see a doctor tomorrow, but I'm really worried. What if it's serious? What if they say we need surgery, and he's still so small.