These are the only way I fasten a prefold diaper - they are absolutely brilliant at keeping diapers comfortably attached to wiggly little bottoms without ever sticking them!  (Note:  for toddlers, who are particularly active, always make sure there are 2 layers of diaper between the snappi and the little one.)

I have used these gems on all three of my babies so far, and have been so glad not to be "stuck" with diaper pins.

There is a new toddler size Snappi available, but I personally haven't bothered with it on my toddlers.  I've always used the standard size, and found it to be plenty big enough - but I do carry the toddler size for those of you whose diapering style is different and who would like to have a wider Snappi.

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2 Snappies  $6.50 (includes shipping)

Colors

Surprise Me Yellow & White Mint & Lilac Dark & Light Blue Red & Purple Pink & Pink

4 Snappies   $12.00 (includes shipping) 

Colors

Surprise Me Yellow & White Mint & Lilac Dark & Light Blue Red & Purple Pink & Pink

A pair of Toddler Snappies   $8.00 (includes shipping) 
Available in yellow/mint pairs only.

Here's what the manufacturer has to say about their product:

 Available in yellow/mint pairs only. Here's what the manufacturer has to say about their product:

DIRECTIONS FOR USE:
Snappi® fasteners need to be used correctly in order to work effectively.



1. STRETCH the Snappi® fastener before its first use. The stretching triggers the 'memory' of the Snappi® to return to its original size and in so doing, pulls the diaper together to the middle to allow for a snug fit. This is essential for the Snappi® to work properly. 

2. Make sure that the Snappi® is ATTACHED SECURELY. It is important that the Snappi® 'leg' being attached be stretched across the diaper before hooking it into the diaper. So,

Hook Left..............Stretch ACROSS and Hook Right......................Stretch DOWN and Hook Center

In other words, the Snappi® fastener should go from a ‘T’ shape to a ‘Y’ shape.


By following these instructions, the Snappi® should be secure, the diaper will fit snugly and the baby should not be able to undo it. ALWAYS place a cover over the diaper and Snappi® fastener.

THE SNAPPI® FASTENER 'MAKEOVER'. NOW WITH AN ADDED SAFETY FEATURE! The Snappi® fastener underwent a ‘makeover’ in 2006. The basic shape and function remains the same, the only change being that the rings at the end of each leg have been replaced with a solid piece with the Snappi® logo embossed on. There is still a crescent-shaped slit at the end of each leg, which not only allows for better grip when attaching the Snappi®, but gives the Snappi® this EXTRA SAFETY FEATURE.

When the Snappi® fastener is not in use, fold the thin strip at the end of each leg to the back of the Snappi®, and slip over the teeth of the white grip. This acts as a barrier and prevents the sharp teeth from being exposed. NOTE: Keep all Snappi® fasteners out of children’s reach when not in use.

The Snappi® Diaper Fastener revolutionized cloth diapering! Over 50 million have sold worldwide. It is an EASY to use fastener that offers a practical and reliable way to fasten a cloth diaper, replacing the diaper pin. It comes in a variety of colors and is made from a stretchable non-toxic material, which is T-shaped with grips on each end. These grips hook into the diaper fabric to ensure a snug-fitting diaper with enough natural movement for the baby. Snappi®s WORK BEST with Snappi® terry cloth diapers, cotton prefolds (Chinese or DSQ), and other cloth diapers with a loose enough weave for the Snappi to hook into. They DO NOT work well flannel or any other tightly woven diapers, even most hemp diapers.

WARNING: 1. ALWAYS use a cover when using a Snappi® fastener on your baby’s diaper. 2. Keep out of children’s reach when not in use! 3. Do not use your Snappi® for longer than 6 months. 4. Do not leave your Snappi® lying in the sun as it is not UV resistant and can reduce the effectiveness of the Snappi®. CARE: Clean your Snappi® in hot soapy water. Do not launder them with diapers in the washer as this may weaken the grip attachment. CAUTION: Any tear in the Snappi® can lead to separation of a piece, presenting a possible choking hazard. Do not cut your Snappi® as this could create weak spots in your Snappi®. Inspect your Snappi® before each use and discontinue use immediately if there is any sign of cracking, tearing, breakage or wear of the teeth or any other parts.

The Snappi® fastener is manufactured from FDA approved raw materials, a polyester based polyurethane which is degradable on aging through hydrolysis and/or microbiological attack. It contains NO latex or any other adulterant, dilutent or modifying polymers. The composition is 100% polyurethane. It is made in South Africa.

Snappi® is an inventive solution to the simple problems of diapering. This unique product was invented by a father who experienced frustration changing his own child's diapers. The first Snappi® was introduced to the South African market in 1987 at a trade fair where 4000 units were sold within days. Mothers were delighted! Their response to Snappi® exceeded all expectations. This product is suitable for new-borns as well as busy toddlers. Snappi® is trusted by moms and dads all over the globe. A snap solution to easier parenting.