I didn’t notice your comment about family history before. This is a large factor in stuttering and if his dad still stutters as an adult there is a higher change your son will as well. Seriously please push for a speech eval. Family history, prolongation and blocks, signs of frustration are all things that you don’t normally see in developmental stuttering. Usually if a parent in passing mentioned they were concerned about their child stuttering at age 2 and that’s all I knew, I also would not be concerned, but if I knew there was family history and the type of stuttering that was happening and it was blocks, I’d definitely refer for eval. So maybe that’s why no one else seems concerned!! Those are all important risk factors that the stutter will persist beyond the developmental phase. I don’t say this to worry you, but just to press that seeing a speech therapist is important! At age 2 you child honestly may be too young to cognitively participate in therapy/have a hard time utilizing and understanding the strategies but you can at least get started/ideas from them. And again, YouTube what I said in my last comment. “The peachie speechie “ on YT is great