I accidentally used an expired Mustela product on my baby. How worried should I be?

If you used an old Mustela product on your baby by accident, it's usually not a big deal if it's only a few days past its expiration date. However different products may break down in different ways after their expiration dates, so it's important to think about the specific product.

While expiration dates show how long a product will keep working and having the qualities it was made for, they don't always mean that it will become harmful after that time. But products that have passed their expiration date may lose their effectiveness, grow bacteria, or change in formula, which could cause mild skin irritation or allergic reactions, especially in babies with sensitive skin.

If you use an expired product on your baby and then see redness, irritation, or pain on their skin, you should take this seriously. As always, the best thing to do if you are worried or see any bad reactions is to talk to your pediatrician. Based on your baby's unique situation, they can give you personalized advice and help.