My baby has had a red and hard cheek for a few weeks. We believe it's chilblains. But this morning it started on the other cheek as well.

If your baby has a red and hard patch on their cheek, it could be a chilblain. It's important to keep the affected area moisturized and apply warm compresses. If the issue persists, it's recommended to consult a doctor for further evaluation. If you have any doubts, you can also seek advice from a pharmacist.