L.S.
Hi -
My son also around month 7-8 started waking up several times. I read it could be teeth and also separation anxiety. Sometimes all he needed was to see me and then I would lay him down again (NOT taking him out of his crib) and he would go right back to sleep. However the interruption of my sleep was very hard for me - even if it lasted a few minutes.
I read about the crying out method and was not entirely in agreement with it due to reading about children vomiting or losing breath of so much crying, as well as getting emotionally and physically exhausted and feeling abandoned.
I chose to do the "controlled crying" method instead which I felt was better and worked for me. I also understood that my son's crying was in protest and about adjusting to change.
Basically you lay them down and say goodnight and then walk out. They will probably start to cry in protest (and stand up) and you wait a few minutes and then go back in and quiet them down and lay them down again telling them it's time to sleep and that you are close by and everything is OK). You do NOT lift them out of their crib. Then you repeat the process everytime letting them cry 5 min more.
I was lucky that I only had to go back in 4-5 times and then he understood and went to sleep. It also lasted a only a few days and then he was sleeping through the night.
We only had to re-start this process after illness, teething or travel (jetlag) and again it only took 1-3 days.
My son actually now gets excited when it's "sleepy time" and takes great naps too.
Good luck and choose the method that works for you!!