my baby was born premature at 34 weeks.now he is 4 months old.when can he hold his neck and start to roll over

A. You should know these two things here that first of all the partial stability of the neck is seen by three months and total by completing the age of six months that is for a full term child with a premature child 3 to 4 months of age is good for partial and 6 to 7 months would be for total control as with a premature child it could be a deal of a month or two and the rollover can be seen between the time of 3 to 9 months in general