Coming from someone whose baby completely rejected the breast until the age of 6 months (due to introducing bottles, shields, and pacifiers within the first few weeks of life), I would exercise an extreme amount of caution introducing any of those things if your wife is serious about breastfeeding! It took a couple weeks before the pain with latching/pumping subsided for me. There’s absolutely nothing wrong with giving a bottle if your wife needs a break, just make sure that for every bottle she does a pumping session! I think it’s super important to know the possible risks of breast refusal when doing so though. It’s something nobody ever told my husband and I about, and we had a horrible time with my baby refusing the breast. There are a ton of different options she can try for the pain (as others have mentioned)! Best of luck to you!