Some women usually start pumping their breast milk after the baby is born. By doing this, the milk supply builds up if the mother is not able to produce enough milk. Additionally, it proves helpful to mothers who want to store milk in the freezer. If you're resuming work after maternity leave, then start pumping a couple of weeks beforehand. If you wait for 4 to 5 days before you start work. Then you may experience that your body doesn't respond to the pump. Further, it may also take time for your baby to get used to taking a bottle. On the contrary, some experts feel that pumping and giving the baby a bottle too early, is a bad idea. Ideally a baby should be breastfed as often as possible especially for the first 6 months to a year. Failing to do so, may cause nipple confusion. This may cause the baby to assume that the bottle is a better and quicker option than the mother's breast.