4.9/5.0 (7,500+ Proud Parents)

Loondie Potty Undies™

From Diapers to Dry in just 15 days – Designed by Pediatricians

4.9/5.0 (7,500+ Proud Parents)

Loondie Potty Undies™

From Diapers to Dry in just 15 days – Designed by Pediatricians

Unlike disposables, Loondie Potty Undies™ use a controlled discomfort method that gently helps toddlers recognize when they’re wet – while still containing the mess. As a result, 91% of parents report progress in the first week.

Unlike disposables, Loondie Potty Undies™ use a controlled discomfort method that gently helps toddlers recognize when they’re wet – while still containing the mess. 

 

As a result, 91% of parents report progress in the first week.

Title

Leak-Proof Design

Reusable & Washable

Made From 100% Cotton

Save $300+ on disposables

Leak-proof design

Reusable & washable

Made From 100% Cotton

Save $300+ on disposables

Size chart

Title
Color
Size
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Unlocked with

5 Pairs

 

Potty Train in 3 Easy Phases

FREE $25

Unlocked with

10 Pairs

 

Free Shipping

FREE $7

Unlocked with

10 Pairs

 

Reward Chart

FREE $20

Fast shipping to United States

1-Year

Warranty

Free Shipping Over $50

Easy 
Returns

Secure 
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90-Day Progress Guarantee

If you don’t feel you’ve made progress in 90 days, we’ll happily refund you.

Frequently Asked 
Questions

What age is best to start with Loondie Potty Undies™?

We recommend starting when your toddler shows signs of readiness—like staying dry for short periods, showing interest in the potty, or hiding to poop. That usually happens anywhere from 18 months to 3.5 years.

Do these work for night-time?

Our undies are best for daytime training. For naps and overnight, we recommend using our Nighttime Equipment for extra protection without going back to diapers.

How many pairs do I need?

Most families start with 5–10 pairs. That way, you won’t run out during the first few accident-heavy days.

What if my child refuses to wear them?

That’s okay—and normal! But these look and feel like real underwear, so most kids are excited to try them. Start with low-pressure encouragement and let your child lead the pace.

Are they machine washable?

Yes! Just toss them in with your regular laundry. Cold wash, tumble dry low. No fabric softener needed.

What if they don’t work for us?

We offer a 90-day Progress Guarantee. If you’re not seeing results or your child isn’t ready yet, we’ll help you swap sizes, exchange, or refund—no hassle.

Do I need to stop using diapers completely?

Not necessarily. Some parents go cold turkey, others switch gradually. Our system supports both—do what’s best for your child and your sanity.

Can it handle poop accidents?

Yep. Shake solids into the toilet and toss the undies in the wash. For messier moments, a quick rinse first helps. They’re built to handle the full potty journey.

How does it actually work?

Most training pants just absorb. Ours teach. 

Loondie Potty Undies™ let kids feel wetness just enough to trigger awareness, while the outer layer keeps leaks in check.

Each pair is made with 6 eco-friendly layers, including:

  • Soft, undyed cotton for skin safety
  • Thick absorbent gauze
  • A waterproof outer shell with fun prints

All hypoallergenic, breathable, and free from harmful chemicals.

Still have questions?

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Loondie Potty Undies™

Everything you need to ditch diapers for good

Loondie Potty Undies™

Reusable

Builds awareness

Feels like underwear

100% Cotton

Eco-friendly

Reusable

Single-use

Delays potty signals

Feels like a diaper

Can cause rashes

Ends up in a landfill

Loondie Potty Undies™

Reusable

Builds awareness

Feels like underwear

100% 

Cotton

Eco-friendly

Reusable

Single-use

Delays potty signals

Feels like a diaper

Can cause rashes

Ends up in a landfill

Shop Now

90-day money-back guarantee included

Hear from

Parents Who’ve Been in Your Shoes

90-Day Progress Guarantee

If you don’t feel you’ve made progress in 90 days, we’ll happily refund you.

    #1 Rated Store for Toddlers    

Join 7,500+ Proud Parents with 
Loondie Potty Undies™ 

Join 7,500+ Proud Parents with Loondie Potty Undies™ 

4.9/5.0 (7,500+ Proud Parents)

LIMITED TIME OFFER

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From Diapers to Dry in Just 15 Days

Rated 4.91/5.0 by 7,500+ Proud Parents

Leak-proof design

Reusable & washable

Made from 100% cotton

Save $300+ on disposables

Leak-Proof 

Design

Reusable & Washable

Made from 100% cotton

Save $300+ on disposables

Shop Now

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Unlock Free Gifts

From diapers to dry – with love, not stress.

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