to much stress and i will find out more. don't worry. the blisters go Thu a course. they usually last about 2 weeks. they r hereditary. they burn and ur mouth is sore. u get them on ur tongue also. they look like normal blisters.
well, it could be hard to do, but, get some warm water and pour 1 table spoon of salt it to the water. then try to get the baby to put the salty water it their mouth and then spit it out. repeat this...