My 20 mo does. He goes to bed at 7pm and wakes at 7am (at the earliest) with no wake ups (except if he's sick or has a dirty nappy). BUT he has only been doing this since 10 months, before that, totally different story! And days are different, most days he has a good sleep but some days he doesn't.

DD was a much better sleeper than DS, she started doing 12-13 hours every night (again, apart from the rare night where she was sick etc) at about 9 months.

Antheia - wow you ARE lucky!! I can't even imagine any of my babies sleeping that long at that age.