When to Start Pumping
If you are planning to return to work or school or will be away from your baby for other reasons, you may want to start pumping a few weeks beforehand. This will give you the chance to practice pumping and will give your baby time to get used to feeding from a bottle.
How Often to Pump
When away from your baby or if you exclusively pump your milk, try to pump as often as your baby is drinking breast milk. This will help remind your body to keep making the amount of milk your baby needs.
Source: CDC