Ok, fak, so bear with me! :P

Motherease have 2 styles, 'Airflow' & 'Rikki'. I think Rikkis are awesome for littlies, because they have gussets (fancy around the legs) for a snugger fit to guard against poo-sposions. I know they don't have snaps, but snaps aren't all that for a newie who might be wailing and erratcially kicking their legs, velcro's faster, and makes for a more adjustable fit.

ok feed done, I'll change a nappy and cme back for part 2 on fit...:P

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Nelle's Post II: This Time It's Personal.

Okay, now that I've got my dramatic sequel heading out of the way, I just tried our Motherease Rikki Small on Silas, who's probably over 9lb now, and it fits him with room to grow - it's a bit loose, but I put it over a sposie, so cloth would make for a good fit. I used the Rikki Smalls with River (who was born 9lb4oz) and I recall he was in them for quite awhile.
So I definitely wouldn't size up to a Medium. I have a feeling that the sizes you've read are wrong - I think I've seen them on a site before and wondered if they were right. I don't think a newborn would fit into smalls straight away (I think it took even Riv a week to fit the smalls).

Yeah a terry flat will add more bulk, but I still think a medium would be too big. Argh, crying baby, hope that helped, ask more if you need.