I just bought a large bamboo Sandys for Blythe, we haven't tried it at night yet but it's doing a great job in the day rotation. She's a little over 20lbs and I just do it up on the tightest poppers. I bought a motherease organic cotton booster fopr it and that's lovely too.
Can I ask where you found bamboo ones for £5 please? I'm mighty curious/tempted