GPs are being urged to take care with the seasonal flu jab amid reports some youngsters have received the wrong one.
The UK's Medical Defence Union said it knew of a handful of recent cases in which children were given flu vaccines unsuitable for their age group.
Some of the jabs in the seasonal flu vaccine programme are not licensed for children under four.
Already "excellent" programme delivery would be improved by reducing errors, the Department of Health (DoH) said.
A spokeswoman for the department said: "It is the responsibility of the doctor or nurse giving the vaccine to check and ensure it is the right vaccine for the patient."
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