big head, big deal??

so, my daughter is 9 months and has always had a huge head (99th percentile 🤓 all those brains!) But I work at a daycare and one of the babies had to have her head remeasured bc they said it was too big. my Dr has never said anything about her head being TOO big, and her weight isn't proportional either. she is consistently below average percentile for weight, so it's not like she's proportionally 99th percentile.. we have her 9 month appt tomorrow and I plan on asking about it but what's the big deal about a big head anyway? 🤔