There are a couple of development threads about on chat/aibu at the moment, the consensus there seems to be that they should have 50 words and be starting to put 3-4 words together at age 2. So a while to go yet!
And they'll make leaps at different things at different times. So you might have a baby who has amazing movement or fine motor skills, and someone else has the amazing talker who just won't shut up.
I think if you're getting towards 18 months and there's still nothing I'd go a see the HV, or if there's a problem like constant earache or signs they can't hear properly I might even go earlier.
But for now Mama, Dada and uh oh (whilst throwing something
) will do. Everything else is a one time only, did he or didn't he say that event.