".......When a mother has an overactive let-down, milk is ejected forcefully from the breast and in great quantity. If this happens early in the feeding, baby may swallow air and consume too much foremilk in proportion to hindmilk. When baby fills up on the watery foremilk, he may get a stomachache from the combination of filling the tummy too fast, swallowing air to keep up with the let-down and the laxative effect of a large quantity of lactose (milk sugar). Some babies are so upset by the forceful spray of milk that they refuse the breast and go on a nursing strike. .....

Description of the issue From La Leche League Site. http://www.lalecheleague.org/llleaderweb/LV/LVSepOct95p71.html

How to treat it: http://www.lalecheleague.org/llleaderweb/LV/LVOctNov95p69.html

A similar article about oversupply of milk: http://www.llli.org/FAQ/oversupply.html