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Methemoglobinemia or Blue Baby Syndrome
"In infants the most common cause of methemoglobinemia is acquired through the ingestion of nitrates through well water or foods. Nitrites produced by the microbial reduction of nitrate (directly in the drink-water, or after ingestion by the infant, in his digestive system) are more powerful oxidizers than nitrates and are the chemical agent really responsible of the oxidation of Fe2+ into Fe3+ in the tetrapyrrole heme of hemoglobin. Infants younger than 4 months are at greater risk given that they drink more water per body weight, they have a lower NADH- cytochrome b5 reductase activity, and they have a higher level of fetal hemoglobin which converts more easily to methemoglobin." https://en.wikipedia.org/wiki/Blue_ba...)