Babies head circumference increased 10 percentile??

Hi ladies! I have a beautiful perfect baby girl and we went for our 9 month check up today. Her head went from 88th percentile to 98 percentile from 6 month to 9 month appt and my peditrician is sending us to a neurologist for a second opinion. She said she doesn’t think anything is wrong and may have a big head but still wants us to go. Has anyone else experienced this? I think she is fine but it makes me nervous!