The Upgrade Kit
The Upgrade Kit
The Upgrade Kit
The Upgrade Kit
The Upgrade Kit
The Upgrade Kit
The Upgrade Kit
The Upgrade Kit

The Upgrade Kit

Regular price€409,90
Tax included Shipping calculated at checkout.

Ready to level up your washable experience after trying The Trial Kit? Then The Upgrade Kit is the kit for you.

It includes everything that you need to upgrade your Trial Kit into The Full Kit.

Available in two sizes – offering a soft and comfortable fit:

  • Size 1: Suitable for newborns up to 8 kg
  • Size 2: Designed for 9 kg to 16 kg

Upgrade today and embrace the full washable journey! 

     Add our essentials and nice-to-haves

    9 x The Wrap
    14 x The Day Inserts
    3 x The Night Insert
    1 x The Liners

    Purchase The Upgrade Kit and enjoy two €50,- discount vouchers for Full Kits—one for your next purchase and one to share with a friend (both valid for 2 years).



    • Snap The Insert(s) in The Wrap
    • Lay The Liner onto The Insert
    • Snap the diaper closed
    • Remove solids together with The Liner and dispose
    • Place the used Insert in The Laundrynet/ The Bin.
    • You can reuse The Wrap (max 3x without washing)


    The Wrap, The Nighttime, and The Inserts are available in two sizes— offering a soft and comfortable fit.

    It's important to note that every child is unique, so the sizes and weights provided below are merely guidelines.

    • Size 1: Suitable for newborns up to 8 kg
    • Size 2: Designed for 8 kg to 16 kg

    The final adjustment for the diaper's fit is made by using snaps positioned on the front of the diaper.

    The absorption can be tailored by layering inserts according to the specific requirements.

    WATER-RESISTANT PRODUCTS (The Wrap, The Wet & Dry Bag, and The Bag):

    • Pre-wash with a short cold cycle
    • Then machine wash at 40° using non-eco powder detergent
    • Line dry in shade
    • Do not tumble dry

    ABSORBENT PRODUCTS (The Nighttime and The Inserts):

    • Begin with a pre-wash using a short cold cycle
    • Follow up with a machine wash at 40°-60° using non-eco powder detergent
    • Line dry or, if necessary, tumble dry on low heat (note that tumble drying may reduce the product's lifespan).

    Download laundry instructions

    Our materials fall into two categories: water-resistant and absorbent fabrics.


    • The Wrap, The Wet & Dry Bag, and The Bag - 100% PUL (Polyurethane Laminated Fabric).
    • PUL is a common material for washable diapers due to its ease of cleaning, softness, breathability, and durability for multiple uses.


    • The Nighttime and The Inserts - 55% Hemp, 45% Oeko-Tex
      organic, unbleached and undyed cotton.
    • This product does shrink after first wash, but has been designed accordingly. 

    Items currently in stock will be shipped within 2 business days. Once your order is shipped, a shipping confirmation email, including a tracking number, will be sent. Shipping costs are calculated at checkout and are free within The Netherlands for orders exceeding €100.

    We accept returns for any reason, as long as they comply with the following conditions:

    • All items must be returned within 30 days of receipt.
    • Products must remain unused, unworn, unwashed, and undamaged.

    To initiate the return process, kindly fill out the return form.

    Please note the following regarding return costs:

    • Full order return costs within The Netherlands are covered by Billie Wonder.
    • Partial order return costs in the Netherlands, as well as full and partial return costs outside the Netherlands, are the responsibility of the customer.

    Please be aware that sale items are non-refundable and cannot be returned.

    Tiny Changemakers...