Talk to Child and Adolescent Psychiatrist on Child Behavioral Therapy

I'm seeking professional guidance regarding my one and a half year old's behaviour. Over the recent period, he has become very stubborn and demanding, often wanting things without any clear or identifiable trigger, and when his demands aren't met, he reacts with intense screaming and prolonged crying episodes. If we observe his learning he do perfectly, he has good memory we divert him instantly in any useful activity and as parents, we follow a gentle parenting approach; we don't raise our voice at him, and we don't use any physical discipline, but these tantrum episodes are becoming difficult for us to manage effectively. I'd like to understand from a pediatric or child development perspective whether this level of stubbornness and screaming is within the typical range for this age, or if it could indicate something that needs closer attention. I would appreciate guidance on practical, gentle techniques we can use in the moment to help him regulate his emotions, as well as any signs we should be watching for that might warrant an in-person evaluation. If any pediatricians, child psychologists, or behavioural consultants here could share their professional insight or are available for a consultation, beside I want to know is it normal behavior or not. I would be grateful for the recommendation. Thank you for taking the time to read this and for any advice you can offer.