Need some honest advice/ support

I posted this in another forum also but also posting it here to reach more people...

Hi ladies, so my son went for his 4 month checkup and everything went great. The only issue is that the pediatrician is concerned with how fast his head is growing. When he was born, his head was 75th percentile, then went to 85th at month 2, now its slightly over the curve so like over 99th. Big heads do run in my family and my son is a big baby anyways. His height and weight is in the 95th percentile, but the doctor said the concern was the change in percentiles from month to month of his head and that the head doesn’t grow that fast.

They will do a sonogram of my son’s head at the hospital. Because he’s not displaying any signs of developmental delays, hemotomas, etc, they need to check for fluid or a tumor 😢.

Has anyone ever had this issue with any of your babies? Or know of anyone? I’m just so scared bc my son is everything to me. He is the sweetest happiest baby and I’m praying nothing is wrong.

Here he is with his big ‘ol head (don’t mind the spit up stain next to his head lol).

Honestly does something look wrong with his head?