I found this shop that stated the description of this anti-fungal Cream:
http://javysports.com/sports-first-aid/326-mycoban-anti-fungal-cream-topical.html
Under the precautions, it was noted that the product is "Not to be used on children under 2 years of age except under the advice and supervision of a doctor".
Not too sure if you would want to use it on your 4 months old baby. Perhaps can check with a pharmacist or doctor before using it? It may contain some ingredient that is not suitable or too harsh for babies.
Anonymous