It doesn't matter if it's big or small, just that your baby stays around the same one for a while. Like mine is in the 99% now and she's been between 95-99% since she was born so it's good. :) all babies are different so it's best to just compare their stats to themselves
Birth: 5lbs 7oz
Follow up appointment 6 days later:6lbs
5 weeks old : 8lbs 7 oz
2 months almost 3 months: 9lbs 4oz
Next appointment will be February so hoping she's heavier now.