Baby’s weight/BMI at newborn appointment

Emily

At birth my baby weighed 6lbs 7oz, and at 8 days old he’s already 6lbs 14oz which his pediatrician was really impressed with. But now that I’m home, I’m looking at his paperwork and it says his weight is in the 16th percentile and his BMI is in the 9th percentile. Is this too low? Should I be worried?