23months old keep saying bye

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My DS is 23months old
He not talking yet
He says 20-30words
Do understand only 20% of commands...
Points only sometimes when he wants to
But my concern is he waves bye to everything if we ask him anything he keep saying bye ...he says bye to fan , to pictures in the tv , to everything .and
pulls his hair when drinking milk...

Is this concerning...

Well firstly if he's saying 20 to 30 words, he is talking!

I don't think the waving is concerning at all but you mention that he only understands about 20% of commands.

Does he understand simple commands such as "kiss Mummy" or "where's teddy"? Does he understand more words than he can say? There is a useful progress checker for his speech and language here.

Yes he understands more than he says

Yes he understands more than he says. That's really good. Did you do the progress checker? Did that through up any concerns?

He understands but that only very few ...he says 20words he understand only approx 30commands ...