my younger baby boy is about 4 month old nw...I wanted to know that generally when should babies start to roll over bcuz my older child(2 yrs nw) started to roll even before he completed 4 months...is it a matter of concern

A. sometimes rolling over can come after 4-5 months so no need to worry for that and it is not necessary that it should come early. many times the weight of thes child is more and that also delays the rolling. if if the growth and weight of the child is within normal limits then no need to worry about it. just carry out regular massage and proper sdiet and the child will be fine in next few months