Is your baby keeping that 5 oz down? How often is your baby eating? That definitely seems excessive but if your baby's keeping it down then I wouldn't worry too much
My daughter eats 6 oz every 3 hours. I promise it won’t hurt them they know their limit they will refuse the bottle when done.
Mine is almost 2 weeks old and sometimes she drinks 1 oz and other 3.5 🥲 I get scared when she drinks over 3 but she isn’t spitting it up so I think it’s okay.
My son is the same way
Mine is drinking 3 oz and sometimes with a snack in between. As long as your baby isn’t projectile vomiting after or throwing up majority it’s okay. New borns grow every day like mini growth spurts. At least this is what my mom is telling me and so far my son is perfect and sleeping more often than not. He’s a lot less fussy too.