Hi, Ds knows a lot of words, he can say his numbers 1-10, but may skip a few. doesnt know colors yet. can make sounds etc, and knows peoples names.. can put words together like " my daddy gone to get petrol" "my daddy gone to work" and a few others.. its just that his pronouciation is bad. I have read that u should be able to understand 50% of what they are saying,.He is more about 25%. Also round us he is so vocal, but to others he is more shy.. Would love to know how your little boys at 2.5 are speaking.. i myself was a terrible speaker and spent a few yrs in speech therapy from about grade prep to grade 3. Also he seems to drop the letter "s" of some words. maybe it will come as he gets closer to the age of 3.