Training undies your toddler won't want to take off.
Stage 3 is the bit between training pants and regular undies. Mostly dry, the odd accident still happens, your toddler's ready to feel like a big kid.
Built to be worn, not tolerated.
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Toilet Training Underwear
$24.95
$24.95
Save $0.00
🎋95% bambooSoft against little bodies
💧Light protectionFor small accidents
🫧Machine washableWash and reuse
🇦🇺Aussie-ownedPractical family support
Product details +
Big Kid Undies (With a Safety Net Built In) 🩲
The final step before real undies. Soft bamboo underwear that catches small accidents while helping kids feel ready for the big kid world.
Why They Work
- Feel-wet design: lets kids recognise accidents and build toilet confidence
- Pull-up style: easy for little ones to dress themselves
- Reusable & eco-friendly: saves money and reduces waste compared to disposables
- Comfy & safe: 95% bamboo on skin, PFAS-free, OEKO-TEX certified
What Makes Them Different
These aren't nappies or training pants. They're the bridge to proper underwear, designed for kids who are nearly there but still have the occasional miss. Light absorbency catches small accidents without the bulk.
View Sizing & Materials In The Below 'Product Size & Material' Drop Down.
Made For
✔ Kids nearly done with toilet training
✔ Daycare & outings
✔ Building independence
✔ Families who want an eco-smart alternative
Size and materials +
- Size 2/3: waist 22 cm, side length 13.5 cm, leg opening 14 cm
- Size 3/4: waist 23 cm, side length 14.5 cm, leg opening 15 cm
- Size 4/6: waist 24.5 cm, side length 15.5 cm, leg opening 16.5 cm
Measurements are taken with the garment laid flat.
- Shell: 95% bamboo, 5% spandex
- Skin-side gusset: 100% antibacterial cotton
- Absorbent layer: 80% cotton, 20% polyester terry
- Waterproof layer: 100% cotton with a PU membrane
Made with OEKO-TEX Standard 100 certified materials.
How to use +
- Pull on like regular underwear during the final stage of toilet training.
- Encourage your child to pull them up and down independently.
- Change after an accident so they stay comfortable and recognise what happened.
- Machine wash cold, then tumble dry low or line dry.
Protection level +
- Light protection for children who are mostly dry
- Designed to catch the occasional small accident
- Lighter and slimmer than Training Pants
- Not designed for a full bladder release, naps or overnight protection
Shipping and returns +
- Free shipping over $65 on Australian orders
- Orders placed before 1pm AWST, Monday to Saturday, are dispatched the same day
- First-time customers can test one item from their first order under our 60-day risk-free trial
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Real undies. Real safety net.
95% bamboo viscose, so soft they won't want to take them off. The slim 4-layer leakproof gusset is hidden inside the lining, not bulked up between the legs.
Outside, they look like regular undies. Inside, enough to catch one accident before the toilet.
Big-Kid Feel
A slim shape helps children practise wearing underwear without the bulk of a disposable pull-up.
Bamboo Soft
The stretchy 95% bamboo shell is made for comfortable all-day wear at home, daycare and outings.
Simple Sizing
Three familiar clothing sizes cover ages two to six, with waist and leg measurements in the size guide.
Wash and Reuse
Keep clean pairs in rotation and wash them again after each small accident.
Two Fun Prints
Whales and Unicorns make getting dressed feel more exciting during the final toilet-training stage.
QUESTIONS, ANSWERED
Everything parents ask us
Still unsure? Our Aussie team is happy to help.
What stage of toilet training are these for? +
Training Underwear is designed for stage three, when children are mostly dry and ready to wear underwear but may still have the occasional small accident.
How much do they absorb? +
The slim four-layer gusset is designed for small accidents and leaks. It is not intended to contain a full bladder release or replace a nappy.
Which size should I choose? +
Choose your child’s usual clothing size: 2/3, 3/4 or 4/6. The size guide beside the selector includes waist and leg measurements if your child is between sizes.
Can I mix Whales and Unicorns in a bundle? +
Yes. Choose a print separately for every pair in the 5-pair or 10-pair pack. You can mix both prints or repeat a favourite.
How many pairs do I need? +
One pair is a simple way to try the fit. Five pairs gives you a useful starter rotation, while ten pairs gives more room for daycare, outings and wash days.
Can they be used overnight? +
No. Training Underwear is for light daytime protection during the final toilet-training stage. Use an appropriate night nappy or dedicated bedwetting product overnight.
How do I wash them? +
Change after an accident, then machine wash cold. Tumble dry on low or line dry, following the care label.
When will my order ship? +
Orders placed before 1pm AWST on a dispatch day usually ship the same day. Free shipping applies to Australian orders over $65.
L
We absolutely love these training underwear! They are such a comfy fit, my toddler loves them and they catch the accident whilst still giving a wet feeling for her so she knows. Highly recommend!
T
We’d hit a rough patch with toilet training where Charlie was refusing to even try, so I wasn’t expecting a miracle. After weeks of resistance, he started initiating trips to the toilet after we put him in Rudie’s training underwear, and it felt like a huge step forward! They are so soft, and compared to others we have tried, they absorb really well - containing the accidents and one less mess for me to clean up!
The prints are gorgeous, they’re easy for little hands to pull up and down, and the quality is fantastic. Looking back, I wish I’d just bought the 10-pack from the start. I tried a few other brands first and probably spent more overall, but these are the ones we’ve reached for every time. I’d happily recommend them to anyone starting their toilet training journey.
S
Comfortable, soft toilet training underwear. My daughter is mostly dry overnight but still has small accidents / leaks. These provide enough protection and are so much more comfortable for her than disposables, and are saving us money too! Highly recommended.
A
Super cute and comfy It fits well, stays in place and my little one loves the whale print. Great quality and perfect for everyday wear
T
Love the boyleg design - no tight elastic cutting into their little thighs! The designs are cute and my little one can recognise toilet cues when the occasional accident happens along the way. A great way to help them learn and transition normal underwear.
A
Has been great, thank you.
A
These are a much needed backstop when toilet training and you are leaving the house. Gave us peace of mind that we weren’t going to have any major accidents while out and about!
A
My little one is loving these. We started toilet training and ripped the bandaid off by using these. She is so happy wearing them and go on the potty rather than get the unicorns dirty. Fingers crossed they continue to work.
O
The prints are adorable! They fit my toddler perfectly.
H
Didnt expect it to be so soft and comfy! My twins love wearing them
M
Didnt expect it to be so soft on skin! Im here to buy more
C
These are great! My daughter loves them. Easy to wear and quick to dry
K
More patterns please. My son is aking for bear design
T
They are soft on skin and quality is good
J
My child loves the whales and feels very comfortable wearing them all day
F
These are honestly so cute and super practical. The material feels really soft and lightweight which is perfect for everyday wear!
D
I am really impressed with the overall quality. The materials feel comfortable and the design is adorable.
B
More designs pls! My twins love them and they are wanting different patterns
J
Were in love with Rudie Baby products! We find them very comfy and useful!
A
Cute underwear! my son is excited to use them
J
Great material. Very comfy to wear
I
Amazing customer service- gave honest feedback on what the best product for my son would be. I really appreciated that she wasn’t just trying to sell me a product that wouldn’t be suitable.
S
These are good quality underwears and very cute prints. And so the journey begins lol. Good luck everyone.
O
Excellent! soft and gentle on skin. My daughter enjoys wearing them
R
My daughter loves it! Hopefully you make more patterns!
N
Great material. Very comfortable to wear.
F
These are really nice! I love the design but hopefully in the future you’ll create versions as girls knickers rather than just boys style shorts
M
Comfortable and fits well. The designs are cute and the material feels soft and durable. Highly recommend!!!
D
Great product! Soft and comfortable
Try it with our 60-day risk-free trial.
First time with Rudie Baby? Test one item from your first order. If it is not right, contact us within 60 days for a refund on that item, excluding shipping. Conditions apply.
