I started with her most relaxed feed, so for me that was the 10am one. I did that for a couple of days then introduced another. Then I changed one a day but i still breastfeed first feed and last feed has been a bottle of breast milk since 4 weeks. I only changed more because she was having dirty nappies with no issues. My boots aren't too sore during the day, but I do let out a little bit out in shower and then express at night. But they seem to be learning quickly,
It'll be ideal if you can stretch it out over the couple weeks, as much as freya has took to the formula fine I'm feeling a bit sad. It's the effect on you too remember.