Probably worrying unnecessarily but what age did your DC start talking?
My son is 15 months and we've only had "mama" and "dada" but not used correctly or to either of us specifically.
He'll shout "mama" or "dada" quite randomly.
He doesn't use any other words but does babble quite a lot.
I've read to him since birth and he loves books but just isn't using language.
First child so I have no idea how old they are usually when they start to develop language but I know a few other mums who's little ones are saying around 5 words at this stage and using them correctly ("car", "Hiya" etc) so I'm just wondering.