my child is three months old...his legs are shivering once in a while....I mean not not everyday, all of sudden for five seconds like that...wat could be the reason

A. shivering in newborn can be due to startle reflex and less likely due to calcium deficiencyz. kindly continue to give breastfeeding to the child and take a video of the shivering and meet your doctor who will tell you whether it is normal startle reflex or it is due to hypocalcemiaz.