Your baby has a viral infection at present which sounds like a bad cold. He cannot tolerate the Zinnat and this could be due to allergy to the antibiotic but it may simply be the taste that he does not like at all which is common with this antibiotic. The rash on his face could be due to the viral infection or to an allergy so it is difficult to nswer your questions with certainty. His weight is on the low side for his corrected age taking into account the fact that he was born at 35 weeks, so you need to discuss this with the paediatrician as well.
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