Janie,

In my ten years in private practice with a large pump rental station, I 
learned quickly that most women express more milk from one breast and 
that women who express evenly are in the minority. You might find the 
following article of interest:

http://pediatrics.aappublications.org/cgi/reprint/117/3/e387

Kent, J. C., Mitoulas, L. R., Cregan, M. D., Ramsay, D. T., Doherty, D. 
A., & Hartmann, P. E. (2006). Volume and frequency of breastfeedings and 
fat content of breast milk throughout the day. Pediatrics, 117(3), e387-395.

"A^ significant difference in the 24-hour milk production between^ the 
more productive and less productive breasts was evident^ (/P/ < .001), 
with an absolute median difference between^ the breasts of 106 g (IQR: 
39–173 g; range: 5–441^ g). For the majority of the mothers (76%), the 
right breast^ was the more productive, resulting in a significant 
difference^ between the right and the left breasts (426 ± 116 g [range:^ 
161–769 g] and 372 ± 109 g [range: 177–601^ g], respectively; /P/ = .003."

The 71 mothers in this study were breastfeeding, but it goes to show 
that milk production tends to be uneven whether mothers express their 
milk or not. Ultimately, as others said, what matters is that there is 
enough milk overall, not whether it is evenly distributed.

Warmly,

Nancy Mohrbacher, IBCLC, FILCA
Lactation Consultant, Ameda Breastfeeding Products
In frigid Chicago, where it is about 9 degrees F today

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