Formulating a clinical question   

First of all, based on the scenario, you need to formulate an answerable clinical question phrased in ways that direct your search to relevant and precise answers.

Recap of Clinical Scenario:

"A young mother brings her 3-month old baby for vaccination. She is anxious and afraid that the needle will hurt her baby. There are two choices of needle length available (25 G 16 mm and 25 G 25 mm) and you are wondering which needle reduces pain, redness or swelling at the place of injection."

Based on the scenario, please formulate a clinical question and type it in the box below:
 
Clinical question: