New born kitten?! Help!!

Hello everyone! Hope you can all see this (: just joined this today. My aunts boyfriend recently found a newborn kitten under his shed. I don’t think he waited for the mother or anything so I think this baby is stolen. Regardless he was only a day old when he was found so they gave him to me because they couldn’t take care of him. I have been formula dfeeding him every two hours and took him to the vet at 5 days old due to his umbilical cord bleeding. It turned out fine and fell off the next day. He was only 4 ounces when I took him in and today he is 9 days old amdnomly 6.55 ounces… This is my !major concern right now. He poops and pees at a normal amount and eats good, is warmed well and has his own space in a cat carrier that I have. I just hope he’s doing okay and his eyes haven’t opened yet. Does he seem healthy to y’all? Wish I could post a picture!