Feeding Bottle

Hello, mommies! When did you introduce feeding bottles to your babies? Especially for working moms who just have 2 months maternity leave? I am having a hard time with my lo since she's breastfed (direct latch) for more than 2 months, and now, she's crying when being fed through bottle. During her first 2 days, she has been breastfed but I stopped nursing her for around 7 days because needed to take a certain medicine which is not good for her. Until then, I started nursing her.