Ive started at 6 months, added 1 bottle per day before night sleep x

I tried to do both with my youngest from about 5 or 6 weeks. I too initially just did the 10pm feed. I started with expressed breast milk then moved to formula. He seemed to be doing well and would take a bottle during the day if I needed him to. Unfortunately it didn’t last long and he decided to refuse all bottle feeds (breast milk or formula) from about 3 and a half months. So we ended up back exclusively breast feeding. He also then became fussy over which breast 😬. Awkward monkey.