Diapering a Newborn -- Do OneSize really work?

Now to answer the burning question...Do OneSize diapers really work on newborns???

Flip Diapers

This diaper is a pretty good fit. I used the Stay-Dry flip insert folded down to the small setting. A tad bulky in the belly area, but as you see from the picture, it's not bad. We've been using the cover over some fitteds, too, which works great. I do wish it had crossover snaps for overlapping, but our boy is growing fast! Recommend for newborn? Yes.

Softbum

This is a diaper that I'm testing prior to bringing into our store. I'm using the microfiber stay-dry insert that snaps into the cover. As far as I know, Softbums doesn't offer a size small insert, only a onesize insert that is folded down. It's bulky, but it does work. I can get the legs of the diaper nice and snug with the drawstring adjustment. It's hard to fit clothing over this diaper, at least for a newborn. Recommend for newborns? Maybe. Only if your kids grow fast. If your kids stay petite for a while, I think I'd recommend a different diaper for the first weeks.

Rumparooz

This is another R&D diaper (research & development). We're using the Rumparooz cover on its smallest setting with the small microfiber insert. It's bulky, but the crossover tabs help get a decent fit. While we don't reach for this diaper first, we aren't exactly skipping it either. It does the job, even if it's not too pretty for an 8.5 lb baby. And the small insert helps it to fit better than some brands. Recommend for newborns? Yes.

Econobums

The Econobum cover fit a lot differently than I expected. I guess I thought it would be like a BumGenius or Flip cover since they're all made by the same company. Not so. The Econobum cover fit is a lot more awkward. But it did fit okay and it didn't leak. We used it with the onesize Econobum prefold. The overall fit was bulky, but doable. For the price, this is a good diaper choice. No pins or complicated folds make it easy to use. The snapping cover should last a while, both in durability and fit. Recommend for newborns? Yes, for a family on a tight budget.

GroVia

I first tried the whole GroVia system of cover & soaker. The soakers are crazy bulky on a newborn, but when I switched to a preemie prefold under the cover, it did okay. I would never recommend the whole system for a newborn, but I would recommend buying the system and saving the soakers for a few weeks. Instead, use fitteds or prefolds under the covers. It saves on buying newborn covers and prefolds are always handy to have. Recommend for a newborn? Yes, but only the covers.

Happy Heinys OneSize

I found this diaper to be really hard to put on properly. We used them with our daughter before she potty trained and loved them, but they're a little trickier on a newborn. The diaper did not leak, but it gaped at the legs and I couldn't get it any smaller. We'll put this one away for a few weeks and try again. HH does make a Mini OneSize for the newborn stage and we like it a lot, so HH does offer a nice alternative. Recommend for a newborn? No.

Knickernappies OS

I have this adjusted to the smallest setting and I'm using a small LoopyDo insert. This particular diaper is a custom diaper purchased from Hyena Cart, but the pattern is the same and the fit is almost identical to the regular KN OS. The rise was high, well over the belly button, but otherwise the diaper fit great. I love side-snaps, so I was excited that it fit so well. Overall fit at 8.5 lbs was super. Recommend for a newborn? Yes.

BumGenius 3.0 OS

I almost didn't include this diaper since BumGenius announced this week that they've discontinued it and I have only a couple left instock. But, since it's a diaper that many of us are familiar with, I went ahead and added it in. The fit was a little bulkier than I expected, even with the newborn insert, but it did just fine. I've recommended it for years for new babies and I don't regret that recommendation. 

Those are all the OneSize diapers that I've tried so far. I still have a few more to come! And remember, these are just my opinions based on my experiences with my son. Different diapers fit different babies, so you may love a diaper that I haven't had luck with. Never hurts to give it a try!