There's actually a funny question as to whether Adam had a belly button, because he never had an umbilical cord. LOL
But maybe he was just created with one.
Adam was also the first man to get born again
Only he was born again the opposite from how we get born again... he was alive, agreed with the devil, and became dead
We were dead, agreed with the Lord, and became alive after turning from our sin and believing / confessing Jesus as Lord.
Now Jesus... was the first born from the dead (Colossians 1:18)...