Discussion
Blue baby syndrome is caused to the human infants due to :
Answer: A
Blue baby syndrome is caused by nitrate.
Infants given water or formula made with water high in nitrate convert it to nitrite in the gut. Nitrite oxidises the iron of haemoglobin to form methaemoglobin, which cannot carry oxygen, so the baby's skin turns bluish: methaemoglobinaemia. Infants under six months are most at risk. Nitrate from fertilisers and sewage in well water is the usual source, and the drinking water limit (45 mg/L as nitrate in India, 50 mg/L by WHO) is set to prevent it.
Sulphate in excess has a laxative effect, while calcium and potassium are essential minerals that do not cause this condition.
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