Co sleeping with 2, including newborn

I currently co sleep and breastfeed my 18 month old at night. She’s always re settled in minutes on the boob. It’s easy. We all get sleep! I’m due with baby number 2 when she is 23 months old. A newborn will disturb her all night so not sure how I’m going to manage.... has anyone managed this? What did you? Any advice I’d appreciate!