Final answer:
The most suitable type of syringe for administering small and precise amounts of medication subcutaneously to infants and newborns is a tuberculin syringe due to its small volume capacity and fine gradations.
Step-by-step explanation:
To administer a small and precise amount of medication subcutaneously in infants and newborns, a tuberculin syringe is typically used. The tuberculin syringe is designed to hold up to 1 mL of fluid and has markings that allow for accurate measurement of very small volumes, which is often necessary when dealing with the small doses required for infants and newborns. This syringe is more precise than larger volume syringes, such as the 3-mL or 5-mL options, and its fine needle minimizes discomfort when administering injections subcutaneously. An insulin syringe is also used for precise measurement, but it is specifically calibrated for insulin units and is less versatile for general medication dosing compared to a tuberculin syringe.