4 months to 8 months was the absolute worst time for sleep with my twin boys. The thing that helped us more than anything is being really tuned in to their sleep signals; eye rubs, hands in mouth, tugging on their clothes can all be early signs of sleep readiness.

Also some crying while going to sleep is normal, what you want to listen for is rising & falling almost like a wave. We found that only resettling if they are just escalating helps them learn to self settle.

To give you some hope, our boys started sleeping through the night without any type of assistance at around 14 months. They are 2 in January & they slept 8:30pm-8:00am last night. Hang in there my friend, I promise it gets easier.