Here are some articles that might help answer your question...

 Prentice A. Regional variations in the composition of human milk. In: Jensens 
RG, ed. Handbook of milk composition. New York: Academic Press, 1995:115-
221.

Michaelsen KF, Larsen PS, Thomsen BL, Samuelson G. The Copenhagen Cohort 
Study on Infant Nutrition and Growth: breast milk intake, human milk 
macronutrient content and influencing factors. Am J Clin Nutr 1994;59:600-11.


Neville MC, Keller R. Seacat J. Lutes V, Neifert M, Casey C, Allen J. Archer P. 
Studies in human lactation: milk volumes in lactating women during the onset 
of lactation and full lactation. Am J Clin Nutr 1988; 48:1375-86.


Prentice A, Paul AA. Contribution of breast-milk to nutrition during prolonged 
breastfeeding. In: Atkinson SA, Hanson LA, Chandras RK, eds. Breastfeeding, 
nutrition, infection and infant growth in developed and emerging countries. St. 
John's, Newfoundland, Canada: ARTS Biomedical Publishers and Distributors, 
1990:87-116.


Prentice A. Breast feeding and the older infant. Acta Paediatr Scand 
1991;S374:78-88.

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