Hiya,
my DS is almost 21 months old, he can say mum, dad, kitteeeee , taa, thankyou ... maybe a few more but these ones get used. he is right now pointing at evrything and questioning in babble, but he never repeats the words, they all sound like the same thing.
He only started walking at 19ish months, he was late to crawl also, used to roll everywhere. I was a little worried as all the kids at mums group (3-6 months younger) have a lot more words and were ALL walking etc, but its perfectly normal development, his father didnt walk till 18 months and my brother didnt walk till 2. genetics maybe?
BUT...if you are at all worried, mention it to the MCHN next visit, they will assess and more than likely re assure you all is well.