Product Info Onesie Bummsie

Onesie Brands our Extenders Fit

Orange Domes Fit:

  • Nature Baby
  • Superfit (Farmers)
  • Superfit Merino (Farmers)
  • Babu
  • Bonds
  • Beanstork
  • TeenyWeeny Cotton (Farmers)
  • TeenyWeeny Merino (Farmers)
  • hippo+friends (Warehouse)
  • Ricochet (baby factory)
  • Mama and Papas
  • Cotton On

Green Domes Fit:

  • Basics
  • dot2dot (baby city)
  • Pumpkin Patch
  • Tiny Little Wonders (Kmart)
  • Zeb (tnt)
  • Ricochet (baby factory)
  • Disney Baby
  • Nature Baby
  • Rock your baby
  • Baby Baby
  • Dymples (Australia Brand)
  • Target (Australia Brand)
  • H & M
  • Teeny Weeny (Farmers)
  • Sookibaby
  • Bonds
  • Charlie & Me
  • Carters
  • Next Baby
  • Marks & Spencer
  • Kumfy Comfy
  • G Baby
  • Sooki Baby
  • Pureborn Organic
  • Lily and George
  • Upside Down Organic
  • Carbon Soldier
  • Wee Babe
  • Simply Merino
  • Gagou Tagou
  • Espirit
  • Baby Berry
  • Baby Biz
  • Tangerine

These lists can change as manufacturers change dome sizes. This we cannot control so please ensure that you check our confirmed list for what you use before purchasing.

Size Options

Short – adds approx 9cm in extra length

Medium – adds approx 12 cm in extra length

3 Pack contains either 3 x Short or 3 x Medium

Care Instructions

Medium wash with maximum temperature 30c. We do not recommend tumble drying.

Do not dry-clean. Do not iron.

Trouble Shooting

My onesie extender bunches, is this normal?

Yes! The Onesie Bummsie extenders have been designed to bunch. This is due to the spacing of the domes on the bodysuits.

How do I know what size extender I will need?

This depends on how much extra length you require and this is different for everyone. If the onesie is starting to get difficult to do up, then a short extender will be the right size for you. If you need more length to get over the nappy, then a medium extender is the one to use.

We sell our extenders in individual packs or in 3 packs with 3 of each size to make this really easy for you.

How will I know when I need to use a onesie extender?

The problem most mums face is the onesies become too short while still fitting through the body. Moving to the next size isn’t always practical especially when the onesie is so big and baggy. If you are struggling to snap the domes in the crotch then it’s time to grab a onesie extender!

Help! My extender won’t fit my bodysuits.

If you find the extender doesn’t fit the bodysuits you have, please contact with the brand of onesie you are using. We are constantly checking brands to make sure our extenders will fit. Onesie Bummsie cannot guarantee our product will fit all brands available. Clothing manufacturers can change their dome snaps without warning, this means your Onesie Bummsie may not always fit.

Can I get a refund if my extenders won’t fit?

If you have purchased directly from we offer a 30 day money back guarantee. We will consider offering a refund on a case by case basis outside of this period. Delivery fees paid by the customer will NOT be refunded. Onesie Bummsie are also NOT liable for the cost of returning any items.

If you have purchased from one of our retailers, you will need to contact them directly. We are not able to offer or process refunds on behalf of our retailers. If you are having trouble with the retailer, please contact us and we will assist you in resolving the problem.


What our customers are saying: 

“I was getting so frustrated with ill fitting onesies, either they were too tight or too baggy, especially on the shoulders. I was given a pack of Onesie Bummsie extenders from my friend who swears by them and I’m really impressed. It's now super easy to do the onesies up! Just what I needed!”


Copyright: Please note that Onesie Bummsie Ltd is a registered company. Our product is protected under the New Zealand copyright law.