Should i get a breast pump

The plan is to breastfeed baby. Will be be returning to work for 4 hour long shifts when he is 6 months old. Worried he will confuse bottles and nipple and prefer the bottle. Currently antenatally expressing into syringes, getting so much out that i dont know what to do with it. It hurts not to express now. 37 weeks with GD is why im expressing. I have a 6 pack of tommee tippee bottles but dunno if i should get a pump?

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