We bought an arm's reach cosleeper when our dd was born 6.5 years ago. I don't think she ever slept in it-- certainly not much. Now we've started using it for our 2 week old, who actually sleeps great in it. I'm a bit concerned about the mattress, though. I've read that using a used crib mattress can be a risk factor for SIDS, so I'm concerned about that. This babe has also peed and thrown up in it a few times without a waterproof pad, so I'm also wondering about any safety issues from potentially having had fluids soak into the foam. Biggest issue is that I've noticed that it's very lumpy/bowed from being folded up in th closet for so long, and that seems like a ral problem-- seems like a safe mattress should be very flat. We're in the process of buying a crib for our room, and I'm wondering if it's worth it for me to get a replacement mattress for the cosleeper, or if a new one would likely still be not so flat, etc. I've been thinking that after we have the crib up in our room, I might like to use the cosleeper as a stand alone bassinet on the main floor of our house so he can nap near me (currently napping in arms since I don't like having him upstairs while I'm down here)-- so it would still get some use if I could feel good about the mattress situation.
For folks who own this-- have you gotten a new mattress for subsequent children, and does your mattress lie perfectly flat?