Only pumping breast milk

Kelsey
My son is 3 months old and I've only been pumping breast milk he will occasionally latch on but for the most part he drinks breast milk from a bottle! Has anyone else ever done this? If so how long did you last doing it? I would like to go three more months for s full 6 months but with him being awake a lot more during the day now I'm finding it difficult to find the time to do it