I remember as a 1st mom w twins i read all the books and always felt like i was doing everything wrong - i know better now w Natalie and just do what i think she needs. I read the books for ideas but do what i want to do. Natalie (9 months old) doesn't sleep through the night still. She goes to bed at 7pm then is up at midnight (for a bottle) and 3am (to be comforted) then 6am (to play) w her twin sisters that wake her up. But she's a ridiculously happy girl that never gets to finish a nap since i always have to grab her out of a dead sleep and go pickup her twin sisters at preschool or whatever other activity they have going on. Do what works best for your kid. Lower your expectations of how long a baby "should" sleep through the night. And just go with the flow & do what you feel is best for your family.
Read this article -> http://sweetmadeleine.ca/2013/10/14/here-are-some-lies-people-tell-you-about-infant-sleep/
More info -> http://www.psychologytoday.com/blog/moral-landscapes/201302/normal-human-infant-sleep-feeding-method-and-development