I took them out while pregnant with our first and breastfed, although not for long but for other reasons, I had them redone before getting pregnant with number two and took them out again and breastfed number two for 6 months.

I still had/have the holes but they are tiny but closed in the middle and blend in with the nipple, I never noticed milk coming out of them.

My concern with feeding was the ends coming off while bub is feeding, for me it was much easier to take them out altogether until our breastfeeding journey was over then have them redone.

*edit* I read the above link and I had no issues with supply, especially after the second bub I would literally be spraying milk out whenever I had a warm shower, it was quite a sight!