My daughter's head has measured in the 90th percentile since she was born. Yesterday at our 9month dr appt her head measure 18.75" which is about 1/2" above the 100th percentile. the dr seemed a little concerned and wanted to see what she measured at her next appt in 3 months but felt her scalp and seemed to think that she was normal physiologically and developmentally. I'm afraid to consult Dr. Google but has anyone in the hive had experience with this? I feel like my husband and i have larger heads could it just be that she has a big head?