I've been looking into building a co-sleeper hopefully one that would last to about 1 year, but due to lack of space it would be getting pretty tight by then but the theoretical dimensions would be 2' X 3' but more of a problem than the actual construction would be the mattress. the one I'm looking at currently is https://www.etsy.com/listing/99892842/wool-filled-cradle-mattress-with-wool?ref=favs_view_13 but sized to fit properly. the only thing that concerns me is the overwhelming opinion that babies need to be on very firm mattresses after they can roll and I'm not sure how solid something like this would be and I'm not sure how worried I should be about that?
Wool Mattress for older infants
thanks for the bump, but after some more research it doesn't seem to be as big of an issue as I thought it might be. My only experience with wool mattresses was making doll beds with the scraps from spinning and needle felting, but apparently the real process leaves you with a fairly sturdy pad, so I'm pretty confident that it shouldn't be an issue.