2.5yr old first words are letters?

[Notsomerryandbright]

My ds is 2.5 and up until a couple of days ago didn't have any words.

He's not really worried me with it because he's always had excellent eye contact, points, babbles, claps, plays appropriately, understands well and can follow simple instructions. He's quite smart and likes his books, his favourite is a book that has numbers, letters, shapes, colours etc and he knows them all.

The only issue was he had no sounds that he used as words in his own way, and had no words that were recognisable either. He does babble a little bit but uses short sharp shrieks quite often to voice disagreement.

But he has just started pointing at the letters and saying some of their names.

I'm so happy to hear his little voice. I'm just not sure if it's normal? His first word isn't mama or juice or something useful, it's letters.

Anyone have similar? Or any SALTs have any advice? I've been keeping language really simple with him, and he hears me and dd3 talking all day. We do lots of ready, steady, go type games, nursery rhymes. I'm probably just overthinking it.

Ds has come on leaps and bounds, he can talk in full sentences but struggles with some abstract concepts of speech.

The paediatrician has signed him off his books for now, he is fairly certain he's not autistic because of how social he is. The Dr was playing with ds, and ds picked up on all his non verbal cues for things as well as engaging in a bit of a chat.

That being said he does still flap about and bounce like there's no tomorrow.
I think we're just in a watch and wait place and probably will be for a while.
Ds has been given an ehcp for 30 hours so will require alot of help at school but again whether this is just a general delay or evidence of a disorder we don't know. He's a happy, fun little boy though!