Cosleeping question

Is it possible to Co-sleep with a two year old and a newborn? This might seem like a silly question but I'm curious with our LO (little one) arriving soon. I feel like the baby might wake up DS (dear son) while co-sleeping with us. He isn't quite ready to sleep in a toddler bed by himself, he will use it for naps but not at night. We have a futon to use and a side attachment for our bed but has anyone done this before? Successful or not?