my baby was 6 months old still not crawling and not left head both side and didn't try to set also any suggestions please

A. You will have to make your child sit with support and a child learns to sit with support from this age and independently by the time of eight months or 8 1/2 months and the crawling comes in the picture by 9 to 11 months I would suggest you to keep your child on a mattress on a floor that would help in better reaching of the milestones