Enzymatic evaluation of riboflavin status of infants.

Riboflavin status of solely breast-fed (SBF) infants aged 1-6 months (study 1) and solely or partially breast-fed (PBF) and weaned infants aged 6-24 months (study 2) was examined by the erythrocyte glutathione reductase activation test. Maternal riboflavin status and milk riboflavin content were also measured in study 1. Riboflavin status of the infants was significantly superior to that of their mothers. However, 35 per cent of SBF infants examined suffered from biochemical riboflavin deficiency as judged by the glutathione reductase test. Supplementary feeding of 6-8-month-old infants and weaning of older infants had positive effect on riboflavin status. There was no obvious relationship between riboflavin status and anthropometric status. Milk riboflavin concentration was comparable or only slightly lower than values reported for Western women, despite marked deficiency in the mothers.