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Blood urea. Normal values in early infancy related to feeding practices.

Urea, as one of the end products of protein metabolism, constitutes a major part of the renal solute load (Fomon, 1967a), and in the young infant its concentration in the blood reflects the combined effect of dietary protein intake, the degree of hydration, and the functional maturity of the kidney (Fomon, 1967b; Edelmann and Spitzer, 1969). Current infant feeding practices in the United Kingdom favour artificial milk formulae and the early introduction of solid foods at the expense of breast feeding (Taitz, 1971; Shukla et al., 1972). Such practices have been shown to be associated with a considerably higher protein intake than is currently recommended (Shukla et al., 1972). These facts prompted us to measure the blood urea of young healthy infants with particular reference to their pattern of feeding.