Mattresses----I went back and forth on that one....did research them, found some that were great--but then the dang things didn't fit in our cribs properly. so, ended up taking them back and got some mid-line ones (Sealy maybe? I don't know, and the kids are napping, so I'm NOT going to check!

), and they fit great. Just make sure whatever you get fits snuggly into the crib. And, they should be firm....I'm more worried about SIDS and strangulation with crib matresses than back development. But, the ones we got are good, so we should be fine through the toddler beds too.
Diapers? Lord knows I've tried them all! We have b/g twins, and to be honest, I've never noticed a difference with either kid and the diapers we've used. Just be sure on the boys to have the diaper ride higher in the front (once the stumps gone, of course), cause they tend to leak out the front more. I did use pampers a lot when they were really little, but then we moved onto Sam's club (just like Costco I think). They were great, until we reached size 4. Then, it seemed like they didn't do well at night. So, now we're on to Huggies. They work fine for us, but I do use Pampers too. Honestly, for us, it depends on what's the best deal price wise. I didn't use preemie diapers at all. You can use size ones and fold them down a bit in front, and you should be fine. Of course, if your twinks are really early, then some preemie ones could come in handy. But, I'd wait to buy those. Get lots of size ones and twos....you'll need them. We're in size 4's right now, and my kids are 19 months.
I had a snow day today! Woo hoo! We're supposed to get another 6 inches tonight. so, I may be off work tomorrow too!
