‘Blue Baby Syndrome’ is due to the presence of which of the following in the blood?

Correct answer: (b) Methaemoglobin

Explanation

Blue Baby Syndrome (infant methemoglobinemia) results from methaemoglobin in the blood.

Methaemoglobin has iron oxidised from Fe2+ to Fe3+, so it cannot bind or deliver oxygen to tissues, turning the baby's skin blue.

It is often triggered by nitrate -contaminated water, but the actual blood substance responsible is methaemoglobin.