There is a lot of debate over methemoglobinemia in babies and it is very rare in NZ. There has to be a lot of predispositions as well as nitrate for it to be a problem. My understanding is that it is nitrite that is the problem so baby requires the correct micro organisms to produce that from nitrate. So called healthy foods such as spinach are high in nitrate, and foods like ham and bacon are high in nitrite.