8 day old still losing weight

Ni

Dd was born 10/9 so 8 days old today. She was born at 7lbs 10 oz and when we left hospital last Friday at 2 days old she was 7lbs exactly. Today we had a weight check and she is 6lbs 14 oz. I’m sort of freaking out even though she is peeing and pooping almost every diaper and nurses every 2-3 hours a day. Is this normal? Doc doesn’t seem too concerned yet but I’m panicking a bit. I don’t remember this happening with my other two kids. Any advice or insight please?