Well I can only give you information on my little girl, but if you are really worried you need to see your HV and your doctor...
My daughter Tia has quite delayed speech..and still does even though she's 8.
She was born with really bad glue ear, so that she had very little hearing in her right ear and almost none in her left... The rattle test they did came back that she could hear, but at a later date we had a proper test done and thats when we found out she was almost deaf.
At the age of 19 months... Tia could say about 5 words.. "at" which was that when she pointed to things, mama for mummy, da for daddy, ay for mine, O for No... she missed all the fronts of her words off..and we relied on sign language/macaton to communicate with her. What made me realise she was really behind was when I called my friend once and could hear her son whos the same age as Tia, chatting away, and I commented how good his speech was, to which she said...Oh no that was her youngest who was a year and half younger than Tia.
It made me feel so bad.
around this time, the HV said she had possible speech delay and referred me to Parenting classes
as seemingly I wasn't talking to her enough and that was causing the problems, which was rubbish....but I went, I would have done anything to help her... after this we were assessed and they realised that Tia's speech delay wasn't related to my parenting skills
, so she was referred to a specialist speech therapy nursery school with a group of 5 other kids with problems... She was the only one not to improve... She had to leave the nursery because the places were only for one term, and she was sent to another nursery school, where a speech therapist was supposed to come into the school once a week, but because of a shortage, Tia was never seen.
Eventually, my parents paid for a private consultation with a speech therapist and hearing specialist and she got grommets fitted at 2 years... From then she started speaking but was still slow... Cup of tea would be dudda dee.., pussy cat would be duddie dat... We moved to Spain shortly after that, and she was lucky enough to get a place at a school here that has a resident speech therapist and educational psychologist and she was having speech therapy 3 times a week... but still it wasn't getting any better so now twice a week she attends a specialist unit for severe speech problems...and OMG has she improved.. It's fantastic.
Whatever happens..you are the mother, you know your child more than anyone else, if you feel that your child is definitely delayed, don't let the medical professionals fob you off with, don't worry, some kids are slower than others, your child will talk soon enough... well I've heard them all and there is nothing more troubling than knowing that your child isn't progressing as they should, and no one wants to help you. I can't tell you if your son's speech is delayed because I only have Tia to compare to, and she was soo far behind.. I think your child could have a problem, but you need to get the ball rolling with the HV and GP first... I really hope it works out and if you wanna chat please pm me...