If you have a sore breast while breastfeeding, besides applying Newman's cream, you can try using lanolin ointment or pain relievers. Applying lanolin-based ointment or Newman's preparation after each feeding can help alleviate the discomfort. You can also consider taking anti-inflammatory medication like ibuprofen if it is safe for you. If the pain, swelling, or redness persists for more than 3 days without improvement or worsens, it is recommended to seek medical evaluation to determine the underlying cause and receive appropriate treatment.