We are using easy peasy hemp inserts or happy heiny hemp stuffins on top of microfibre. I imagine for a 2 month old you won't actually need as many layers of hemp as we do. Actually when Kayleigh was younger (12 months old) we got away with a BG - an easy peasy hemp insert on top of the microfibre insert that comes with the BG. Actually I think Annette still had a few of these microfibre inserts for sale she got brought over from America.
Sorry can't help much as we didn't do night nappies at this age!!! I think what Rae has said sounds right though - I stuff Isabelle's with tons of hemp and bamboo but you wouldn't need as much as I use at that age... I usually use a bamboo terry (you can get little ones from http://www.babeco.co.uk ) and put hemp underneath which you can get from http://www.easypeasynappies.com and I made my own too using hemp jersey bought from babeco.