I know they all develop speech at different rates, and I'm not really concerned about it, but I was wondering about your experiences with toddlers starting to talk. DS is coming up to 2.5 years and is still not talking in sentences. He strings a couple of words together - 'Oh No!', 'all gone', 'I did'. He will sometimes say 'all day long', if The Wheels on the Bus is being sung. That's about it. He does say quite a lot of individual words, but he doesn't say the 'whole' word, if you see what I mean, eg. bus is 'bu', hat is 'ha' etc.
I'm sure he can understand almost everything that is being said to him, and easily carries out instructions, I was just wondering if this type of pattern of speech was fairly common, and when the proper sentences and complete words kicks in?