My DS sounded similar at that age, but as time went on we could see clear patterns of atypical development, and now he is very likely ASD. Still a happy, lovely, curious, smiley and sociable little boy, and still always developing, albeit at a different rate to majority of his peers.
Paediatrician we are under did a tick box exercise which wasn’t entirely useful, but he referred us for bloods, which came back clear, a hearing test and SALT. Hearing test passed no problems. SALT (NHS speech and language therapist) were the most helpful for us in determining DS language acquisition, and it turns out to be very in line with hyperlexic / gestalt language processor, with a bit of analytic thrown in. (Google it if unsure) Essentially this helped me understand so much about how my son’s brain works. He’s a whole > parts thinker and it’s more typical for development of language to begin at around 2 - 2.5 years for a GLP, rather than the neurotypical earlier ages. I both worry and don’t worry about it! Our portage worker said that she think our DS will be fully verbal, and in terms of likelihood, it’s far more likely that your child will gain verbal speech than not.
My son is a very visual thinker (common for hyperlexic / GLP) and learned quite a lot from YouTube and flashcards, more so than me just speaking to him. Things like teletubbies helped him understand certain concepts, given that it’s repetitive and very visual, and other things such as Oxbridge baby and baby Einstein. Also use subtitles as he enjoys ‘reading’ the words aloud. Lots of jargon, lots of verbal stimming round here, and some comprehensible stuff in between! We’ve reduced asking questions and kept things factual, along with using highly intonated speech and song.
In your case it could be speech delay, or it could be something neurodivergent such as autism. With a speech delay there would typically be a lot of non-verbal communication and understanding though, just limited / no verbal speech. You could always mention speech and language / worries about autism to get the ball rolling, as IMO it doesn’t hurt to mention these things. If you stay silent you might not get the support in place.