It is difficult to answer your question without being able to see your baby's rash.I presume that he has an allergic rash due to an allergy that he has developed to the Buscopan.If he does have an allergic rash he will need an antihistamine for a few days to try to clear this rash. The only safe antihistamine for a baby of your son's age is Zyrtec drops.His dose is one drop of the Zyrtec drops once a day by mouth.You may need a doctor's prescription for the Zyrtec drops but first ask your pharmacist.
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