Tegan,
I have No idea, Maddy slept in a soleeping bag thingy my Mum made & I bought Indah an all in one sleeping bag thingy on Sale at Kmart (Winnie the Pooh style) & they both slept/sleep all night in them...
I put Indah in hers with just her nappy on & once it cools down my sister has bought her from last Winters Sales Flanny Jammies in Size 1 from Kmart for $1 a pair!!!!
So thats what I use!!