Generally speaking, there is no exact date after the birth that you should begin to pump your breast milk. But first, you would want to get your babies used to breastfeeding before introducing them to milk bottles. This is to prevent the problem of “nipple confusion” when a baby decides that using the bottle is a better way to drink milk and doesn’t interested in breastfeeding anymore. That said, if you’re planning to return from your maternity leave, you can also try to pump milk into bottles and store them in the freezer to prepare for the upcoming weeks. Try to keep a free mind and stay away from stress when starting to use the breast pump, as these negative elements can cause your body to slowly react to the machine and making it more difficult to fill up the bottles.