We co-sleep but thats with DH and I with DD in the middle. We have done this since DD was 4months old. We did it with our first DD who is now 5 and she still sneaks in although now we make her get in baby DD's cot which is against the bed as we don't want big DD kicking baby DD (big DD thrashes around alot). She is in the cot 50% of the time and in her own bed the other 50%. It works well for us and will help DH when I return to night shift (930pm until 730am). At this stage we have no plans on moving baby DD out and when she does maybe she will share with her sister as they both like to bedshare. That may change if I decide to ttc again as I would be worried about getting kicked by DD when I was pregnant. When I was pregnant with my last bub we really started getting big DD into her own bed for this reason as well as to prepare her for not always bedsharing with us when we knew another baby would need to come in (for BF's) We didn't want her thinking she had been turfed out when the new baby arrived.