Ok I've just bought some flannelette sheets, $12.50 on sale at Target, bargain! Wish I'd thought to look for a woolen underlay too, doh!

Maybe I'll have to revisit the heat pack - I'd been doing them in a jug of boiling water, hadn't contemplated microwave.

Those snap things sound great - will have to have a look at eBay!

He's already in a sleeping bag and he doesn't wriggle too much, it's more keeping the cot warm when he isn't there!