In Small children and older infants, the usual maximum volume for IM injection at one site is?
1 ml. in small infants, the muscle mass may be only be able to tolerate a vol of .5 ml using a 1/2 -inch needle. For older children the volume should be indivualized. Ped is 1 to 1 1/2 inches long depending on the assessment of the depth of the muscle mass in the child. Ped can use 31 gauge , 1/2 inch needles