Helen arrives two hours later with her mother and baby John. Helen apologises for taking so long, but the baby had fallen asleep and she didn’t want to wake him. John is now awake and smiles and wriggles when you pick him up. Helen tells you that John is drinking normally.

Examination reveals a well-looking baby and there is no fever. The injection site is slightly swollen, around 2 cm in diameter and is redder in colour than the surrounding skin. There are no other abnormal findings.

You inform Helen that John is not sick, and that these side effects are of the mild variety and she should definitely return for John’s next appointment in two month’s time.