Oh my goodness, what a beautiful baby! He is precious!
It is so nice to see him actually enjoying himself. As for seeing the mark on his head -- a friend of mine had two of her four kids born with a condition that makes the skull harden rapidly. The literally cut the skull wide open to fix it.
Her daughter looked like she had some kind of headband on afterwards but as soon as her hair grew in, you couldn't tell. I think lil Mikey's shunt will disappear in the same way.
Continuing to prayer that all keeps going well for your little man.