Go and get yourself the book, save our sleep by Tizzie Hall. I had the same problem with my DS. He was driving me insane. I ad the book in the cupboard from my first bub, and didnt really use it as she is such a good sleeper. I have had my DS on her routine for the past 3 days and now he is sleeping two large sleeps during the day and at night he goes from 7.00pm to 7.00am. The routines have to be followed to the dot, but its well worth it!!

Good luck... The book save our sleep has a website so you can download a routine for a small cost online. I got the book, it has lots of tips and advice.