I was fine with Brendan (2yr5m) coming into our bed during the night until Tristan was born... most will say it's a bad idea to make sudden changes so close to a new baby, but you have to do what you have to do and I put the cot mattress (DS1 has his own toddler bed) on the floor on my side of the bed and he is happy to sleep there most of the night, once he comes in. He still gets into our bed but it's not usually until 6am or so. Then there was four

So both boys start off in their own beds, and end up in ours... so we all get the best of both worlds.