Hi...by what you quote I feel that your kid has got 2 problems which need to be addressed -
1. Skin problem in the form of blisters.
2. Loose stools.
1. Skin problem - kin conditions are best diagnosed only after seeing directly. I suggest you to upload photographs of the same on this website, so that I can guide you scientifically.
2.
Diarrhea - I do not think it is diarrhea at all as he is passing stools every time after feeds - What your kid is having is not a diarrhea and is only a gastro-
colic reflux. It is quite common for babies of this age group t pass small amount of diarrhea or loose stools soon after feeds. This need not be treated as diarrhea and especially antibiotics are not indicated.
Unless the kid's having low urine output or very dull or excessively sleepy or blood in motion or green bilious
vomiting...you need not worry.
Hope my answer was helpful for you. I am happy to help any time. Further clarifications and consultations on Health care magic are welcome. If you do not have any clarifications, you can close the discussion and rate the answer. Wish your kid good health.
Dr. Sumanth MBBS., DCH., DNB (Paed).,