I would start by mixing the formula with breastmilk and start with more breastmilk to formula ratio then slowly add more formula every day until it’s just formula. For bottles, try using nipples that are similar to the breast. Any nipples that passes the triangle test. I use Evenflo wide balance nipples and my 9 week old goes back and forth from the bottle to breast fine.
I would start by mixing the formula with breastmilk and start with more breastmilk to formula ratio then slowly add more formula every day until it’s just formula. For bottles, try using nipples that are similar to the breast. Any nipples that passes the triangle test. I use Evenflo wide balance nipples and my 9 week old goes back and forth from the bottle to breast fine.