Flu Vaccine Needle Sizes for Children: Gauge & Length Guide

Needle selection for pediatric influenza vaccination depends on age, weight, and injection site (anterolateral thigh for infants, deltoid for older children).

CDC-Recommended Needle Sizes (Intramuscular)

Age Group	Needle Gauge	Needle Length	Injection Site
6 months – 3 years	22–25 gauge	1 inch (25 mm)	Anterolateral thigh
3 – 10 years	22–25 gauge	1 – 1.25 inch (25–32 mm)	Deltoid (or thigh if small)
11 years – adult	22–25 gauge	1 – 1.5 inch (25–38 mm)	Deltoid

Key Points

• Use clinical judgment: larger/heavier children may need longer needles.
• Too-short needles risk subcutaneous deposition (reduced immunogenicity).
• Aspiration not recommended for IM vaccines.
• Intranasal (LAIV) is an option for eligible ages 2–49 years.