Switching from bm to fm

I had to do mixed feed since baby is 1 week old as I wasn't producing enough and baby was in NICU. I'd say change to formula if u have a gd reason for it cz BM is still the best for baby. I feel guilty at times for having to supplement with FM but it's sth I can't control. If u have no issues with milk supply and baby is latching fine but u just feel tired from breastfeeding all day, pump and do bottle feeding. Or if u're having supply issue, do mixed feeding, at least baby still gets ur BM. I do FM x2 a day and the rest BM. Baby is still gaining healthily.