your bub is 11 months now, i don't know what size, but i found the baby beehinds bamboo (which is what i'm assuming you're using at night) weren't absorbent enough, for my bub after about five months old. When her wetting ability upped, i also upped the ante on her night nappy.

When you shop for night nappies, look for how many layers the nappy has of absorbent fabric.

The outers might be Malden Mills Fleece like WIndpro (in the Kester Kovers AIO, the Staccinator covers, the Sugarpea Covers.

The construction of the absorbent bits is also worth reading about, if you have several pieces (e.g a trifold and boosters) the night nappy will dry faster. So for example, 14 layers of bamboo all up is great for absorption levels, but just make sure that you're getting several "bits", each one being two or three layers thick.

so many night nappies to think about!

Wrigglebumz nights
Peep-O Bamboo night nappy
Sweet Dreams pocket nappy by bits for bots (needs a cover)
Kester Kovers AIO by Possum Pouches
Cherub's Kiss Bamboo night Honeyboy (need a cover)
Wild CHild bamboo terry night nappies (need a cover)
Very Baby Simply Nights
Cuddles n Cloth night nappy

Do you know about OUTER boosting? You can actually OVERSTUFF a fitted nappy, and end up with leg gapes (which mean you'll get leaks). You can avoid that, by OUTER boosting. You put nappy on so you can do it up WITHOUT leg gapes, then BETWEEN the outer of the fitted, and INSIDE the cover, you put boosting. With your bub, put it on the tummy side, e.g put a bamboo foldup there. Position it, where you get the leaks with your bub.

Night nappying is about customising the nappy to your bub i reckon, it's quite individual. To me, it's all about what you have for the absorbency.

There is an excellent topic on Nappycino, called Night Nappy Struggles, where people list what they're having problems with, and others post possible solutions, great thread to read.

re the fleece
The liners - microfleece - keep using it, unless your bub rashes up (the fluid goes THRU it)
The covers - double polarfleece or single layer of Malden Mills Windpro (this is waterproof)
so they do two very different things, i havne't explained it well enough, but just keep those two fleeces separate in your mind.

and then there's BAMBOO FLEECE, HEMP FLEECE, which are ABSORBENT fleeces. That's what you want the boosters, foldups, trifolds etc to be made out of, to ABSORB the wee during the night. They are antibacterial fabrics and will keep soaking up fluid, even when soaked.

hope i havne't bamboozled you too much!

ozclothnappies have a great FAQ link which explains heaps too.