U can pump and feed BB at the same time, or pump after you feed baby, or pump milk between meals which will not accept the 奶量
I bought manual pump as I can bring it to work where may not be easy to fine power socket. Manual pump is portable and Electric pump can save energy but may be more noisy
If you just pump but don't direct feed your baby, it may reduce the milk volumn. When U are available, try to feed baby in personal as much as possible.