Label the milk with the date, and keep it toward the back of the freezer for the coldest temperature. Friday's milk is saved for the next Monday, and over the weekend they don't pump at all. Milk can be refrigerated for several days or frozen for several months. The oldest milk should be used first. Milk should be thawed under warm running water, not on a stovetop or in a microwave, then shaken to re-mix.
Some mothers combine breastfeeding and formula.
Remember that even a little formula given in the early months alters a baby's system and cuts into the benefits of human milk. On the other hand, even a little breastmilk improves the nutrition and health of a mostly formula-fed baby. Using formula will reduce your milk supply, and can result in an earlier weaning than you would like. When you've weighed all your options and feel comfortable with your choices, you've done what's right for your family. Bottles Almost all babies will gradually accept a bottle if it's not forced on them, and if someone other than Mom offers it.