Please don’t worry, our son had speech therapy when in primary school because he couldn’t say certain sounds properly, he attended once a week for around an hour and brought home “exercises” to do at home.
He went for one school term, and has been fine ever since (he’s now 23!)
The speech therapists were absolutely lovely, kind and patient.
Your dear GDS will be fine, they can also pick up other potential issues and he’s so young he should do very well 