My baby is 8.5 months old and from thr last 3 months....he wakes up many times in night crying out . After feeding him he still wakes up after sometime.

your baby is in a growing stage and it is possible that your baby is waking up due to hunger. i would suggest bring down meal time closer to bedtime. if your baby has milk before sleeping, give it right around bedtime to keep the gap between feeding and sleep as less as possible. also, check if your baby's clothes are comfortable enough and your baby isn't feeling cold or hot while sleeping. also check the bed sheet and pillow cover to ensure they are comfortable. your baby is growing and may want to play more, which is very normal. instead of giving in and playing in the middle of sleep time, sing a lullaby and pat him to sleep