Here are some tips for helping your baby sleep well at this age:
Develop and follow a bedtime routine. If you haven't already established some sort of bedtime ritual, start now. A bedtime routine should help your child wind down and get ready for sleep, and at this stage your child will really begin to participate.
Whether your routine includes giving your baby a bath, playing a quiet game, getting your child ready for bed, reading a bedtime story or two, or singing a lullaby, make sure you do it in the same order and at the same time every night. Babies like having routines and schedules they can count on.
Encourage your child to fall asleep on his own. To nap well and sleep through the night at this age, your baby has to learn to fall asleep on his own. Try putting him down before he nods off, so he can practice. If he cries, the next move is up to you. Do wait at least a few minutes to see if he's really upset or just fussing a little before settling down.
Try putting him to bed earlier. If your baby's used to going to sleep after 8:30 p.m. but sometimes can't wind down, try putting him to bed a half-hour earlier. It could be that he's overtired and you may find having him hit the hay sooner will help him sleep more soundly.
SOURCES:The Babycenter Medical Adivisory Board (2015). How to help your baby to sleep. Baby Center [Online]. Available: http://www.babycenter.com/0_baby-sleep-basics-6-to-9-months_7657.bc