(Person who stutters who studies speech and language therapy - disclaimer: I am not a speech and language therapist and therefore am not qualified to give you advice, the below is my comment from my personal experience as a person who has stammered from childhood) I’ve noticed there is a lot of emphasis on noticing what your child has said, not how they have said it. Personally, because he’s 7, I wouldn’t mention it until he’s above 10 and has more of a understanding or has noticed his stutter. The Lidcombe Project is incredibly outdated and also follows the speak more fluently approach (also the EBP has shown that children develop anxiety because of their stammer from this approach). SLT these days focus on stammering more proudly and there’s been more of an approach towards acceptance and embracing a stammer rather than changing it (The Michael Palin Centre is an amazing resource) Chances are he already knows, but let him mention it. The important thing is what he’s saying, not how it’s said as this puts pressure on the child and can make them really anxious of their stammer. Some children grow out of stammering naturally and some can with therapy whereas others can have it well into adulthood (like me for example). I think the most important thing is removing the stigma around stammering.