Before one of our breastfeeding sessions, I noticed that my 3-month-old has a blister on his lip. What should I do?

It is common for baby to have blister on lip especially in their first few months. This is usually resulted from frequent and vigorous sucking. In their first few months, babies are nursed more frequent and the friction resulted from sucking can cause blister. However, mommy should not stop breastfeeding just because of that as it is usually harmless and will not cause any discomfort to baby. There is no need for treatment. It will normally recover by itself after a few days and it may develop again. http://www.livestrong.com/article/545314-can-babies-get-blisters-on-their-top-lips-from-breastfeeding/