Artechim he only has 2 words there and yes. He doesn't say mommy or daddy and the concern at this stage is that he will say a sound/word and never again. The SP is leaning towards oral-motor issues, possibly dyspraxia. He seems to have an inability to form certain sounds.
My DS was the same at around the 18 month mark. All he had was 'no' and 'bye bye'. He had said a few other things, mama, dada etc earlier on but didn't use them in context. He also wasn't a big babbler.

Even at 2 the vast majority of his words were animal noises. he did have mummy and daddy, and a few others by then, but not a great deal. Fast forward to now (2.5) and his language is actually quite advanced.

I'm no expert, but based on my experience I think you're worrying a bit too early. Like someone else said, I would be waiting till 2.5 before I started getting really concerned.... JMO