Block feeding is when you only feed on one breast per feeding. It is a great method if you have a large milk supply. If you don’t you may put yourself into a situation where your milk supply decreases. When you are lactating your body is a milk making machine and it functions on supply and demand. If you block feed, a breast can go 4-6 hours or longer without being stimulated. The body will begin to produce less milk in that breast because stimulation times have been stretched out. Block feeding is the answer for women with an oversupply, example pumping 5-10 ounces or more out after infant has fed. Block feeding can also be the answer for a true foremilk/hindmilk imbalance. Seek professional help if you are contemplating block feeding. http://www.mother-2-mother.com/blockfeeding.htm