Hi, I'm a mom to DS 3y, DD1 1.5y and I'm currently expecting DD2. Currently we live in a very small house with 2 bedrooms, in the future we plan on moving somewhere bigger. The nursery is specially very small and currently DS is sleeping in a toddler bed while DD sleeps in the cot. I co-slept with both of them for over a year and I plan on doing the same for DD2. I had the idea of getting a bunk bed where DS could be at the top and DD1 at the bottom, and when DD2 turns 1.5y she could bed-share the bottom bed with her sister so that they could enjoy more space to play in their bedroom. Is this a good idea?