I have vivid memories of my DD1 at a young age. My Mum had looked after her and was suffering quite badly from depression. I got home and saw that her drink cup was in the same posistion as when I had left. I asked how much she had had to drink and my Mum realised that she hadn't. I went mad and my Mum was so sorry, then she said "she didn't ask". I remember saying "DD1 doesn't know how to ask yet, Mum."
She was my first, and I had no idea, at that time, just how abnormal it was that DD1 didn't ask for her drink. I don't mean the verbalisation, but she didn't ask, or communicate thirst, hunger, etc at all.
It was 2 years later that she had her brain malformation diagnosed.
I have 2 other daughters (younger) and as they have grown, I have realised all the more that it isn't the words, but the communication that was missing with DD1.
You have had great suggestions, so please don't worry. DD1 at 4.9 now, has a severe Speech and Language delay, and in fact she attends special school, but she is communicating, she expresses her wants, needs and opinions. It is harder for her to say what she wants and needs, but she manages in her own way.