head size

Hi i have a daughter po she's 2months and 2 weeks old..galing kame ng pedia today and sinukat nya head ng baby ko and 36cm and nabother sya tinignan nya chart nya and told me na below average ang size ng head ni baby ko for her age. Ang recom nya agad is to see a neuro..nagpanic ako ng sobra..mommies tama ba sya na neuro agad or should i see another pedia for 2nd opinion..let me know kung may ganto kayong case..it will really make me calm and at peace.. thanks