5 month old with small head circumference

Anyone out there have a baby that was measuring very small head size? Isabel is 5 months old an only in the 3rd percentile for head circumference we went to the dr today and she has referred us to a pediatric specialist.

I wasnt to concerned going into the appt because shes hitting all the right physical milestones or beating them a little but ‘behind’ with her language but Now I am a little worried about it.

Anyone else had a similar thing?

Heres a photo 😍