my baby is 8 month old still he is not roll on

A. Generally Rolling over comes at 2-5 months of age.   Proper neck holding comes at 3-5 months of age. Commomly baby start to sit with support at 5-7 months of age and  Sit without support at 6-8 months of age  Baby start to crawl at 7-9 months of age  Baby start to stand with support at 10-11 months of age  And stand without support at 11-13 months of age  Baby start to walk with support at 12-14 months of age and walk without support at 14 -15 months of age. Encourage ur baby for each and every activities of ur baby  Stay with ur baby only  It will help  for  early achievement of millstones.  visit ur nearest pediatrician once