My baby is 21/2months old weight is 5 kgs nd not yet rolled over is it fine

Yes it's absolutely ok.
Baby should gain double weight when he turns six month and triple when he turns one year.
Achieving milestone differ from baby to baby.
Don't worry
Check this link Understanding baby development nd milestone

Each baby take their own time to achieve milestones. Give some time. Roll over happens after three months or later. If the baby is active and taking feeds well don't worry about it right now

Hi deepthi... babies generally tend to roll over after the 3rd month so don't worry 😊