my daughter is 6 month old but neither she is rolling yet nor able to sit properly. what to do

A. Are the rollover is seen between the age of 3 to 9 months so give more of tummy time to the child to encourage the child and apart from that also I’m going to recommend you that a child should be made sit after completing the time of six months and learn to sit independently by the time of eight months to 9 months so kindly have patience for that