I used the "contented baby" book with #3 when he was a baby, and her approach is that basically its a wholistic approach to the entire day rather then just the night times.
for a 7 month old :
*they shouldnt be having more then 3 hours sleep during the day.
* should be having at least 2-3 solid meals a day
*should be having at least 3 milk feeds a day
its more about establishing a good routine during the day also.
*baby shouldnt sleep at all after 2:30pm
*feeding by 6:30pm
*baby should be awake by 7am to start the day.
i loved this book, and had a great experience with luke as a baby using it, and he is still now a non demanding toddler.