My son was diagnosed at 4 with ASD. He never lost his speech but has a very slow gain, which makes us concern and we went to a neurologist in CA. He ordered MRI.
He don't have any sensory issue, hyper, silly, emotional well connected to us not to his little brother, language delayed, less focused, no meltdowns, academically doing okish (maybe better if focused), has some OCD.
He is 6.5 now, we are very much worried.