My 10 month old was born 1 mth prematurely. He started crawling at 9 months and can climb the stairs and cruises. He alot of teeth for his age - 6 teeth with another couple on there way. My problem is that he doesnt babble at all. he makes 'ssssss' sounds and raspberries and a few vowel sounds but does't babble constanants like da ba ta etc. He is also very grumpy and i am always being told what a serious baby i have :( any ideas or advice?