I originally posted this in Behaviour & Development but it was suggested I might have more luck here ...
DS is 21 mths and really only says one word which is DD's name (but this is a v simple 2 syllable word). Doesn't say mama/dada etc. He does babble quite a lot and is v communicative in other ways so often makes himself understood. Also, I have no concerns about his hearing because he understands most things I say to him. He has v little interest in repeating words back, usually just grins and doesn't try but occasionally when he does try, his attempt doesn't sound anything like the original word.
DD was already repeating words at a year old and seems to have not stopped talking since (she's now 4) which just highlights DS lack of speech.
I'm not worried about DS's lack of speech yet (she says tentatively!) but wondering at what point I should be visiting the HV to seek some help?