I replied to this last night but apparently it didn’t post. Even got told it was a duplicate reply when I clicked submit again 🤷♂️
Anyway, is this your son’s first adult passport after having a child’s one or first one ever?
All first passports are actually treated differently, there’s first adult after having a child’s one, first adult after naturalization and first adult passport ever.
From people I’ve spoken to, first adult passport after having a child passport and first adult passport after naturalization may not always require an interview depending on the timeframe.
First adult passport without having held one before 100% requires an interview now. This is the case for mine, as told to me by 2 different advisors. I don’t believe any first adult passports are eligible for fast track as well.