No Leak Diapers

Huggies Overnights! They are the only thing that works for my son. You should be OK in a size 3. My 8 month old daughter wears 3s at night. Both my son and daughter wear one size up in overnights from their daytime diapers and it works beautifully!

I second Pampers Cruisers!!!

I highly recommend Pampers Cruisers and you may need to go up a size. My daughter has never leaked overnight in Cruisers and there are mornings she wakes up with "got your moneys worth" diapers! My girl is 17 months old.

Huggies actually makes overnight diapers. I am not sure what sizes they have since we just buy them for our 2 1/2 yr old sz 5. But they work great.

costco kirkland diapers are great!!! they never leaked for me at night time!

J.,

We use Pampers Cruisers during the day and use Huggies Overnights for bedtime. I'm not a big fan of the regular Huggies but the overnights have been a lifesaver! You'd probably need a 3 and my Target and WalMart did not sell them so I had to get them from Babies R Us.

Huggies Overnights are great. You can also get "Diaper Doublers" at Babies R Us - they look like a maxi pad without the adhesive side - and they just make act as an extra layer of absorbtion - they are awesome!

We use luvs, and the only time my kids have leaked is when they are a bit too big for the diapers. I move them up a size and they are fine. I find, in general with which ever brand we've used, that we move the kids up before they reach the weight limit. My kids are long and skinny, so their capacity for making more mess and their length necessitate the move before the weight fits completely (1-2 lbs off) and the diapers fit fine...

I also recommend the Huggies Overnight diapers. Not sure how big your little girl is though -the smallest size I was able to find in them was a size 3, and I only found that at Babies R Us. They work great though.
And it might just be time to up her diaper size. Usually when my son would start leaking through, if we went up a size, then it would stop.