Choosing the right fake maternity bump is essential for achieving a natural, comfortable, and realistic appearance. This Size & Colour Match Guide provides detailed diagrams, measurement tables, and weight information for all Moonbump® shapes, along with guidance on selecting the correct bodysuit size. You’ll also find a step-by-step explanation of our silicone colour matching process, outlining how we create a bespoke skin tone match when required. Use this guide to ensure the best possible fit and finish for your fake maternity bump.
Fake Pregnant Belly Dimensions & Weights

![]() Outside Height (outside surface through belly button) |
43cm (16.9in) |
|---|---|
![]() Outside Width (outside surface, side to side) |
47cm (18.5in) |
![]() Inside Height (inside surface next to wearer) |
38cm (15in) |
![]() Inside Width (inside surface next to wearer) |
38cm (15in) |
![]() Depth (through belly button) |
8.5cm (3.3in) |
Weight |
0.5kg (1.1lb) |
| 3 to 4 Months (13 to 21 weeks, 1st to 2nd Trimester) |
5 to 6 Months (22 to 30 weeks, 2nd to 3rd Trimester) |
7 to 8 Months (31 to 38 weeks, 3rd Trimester) |
8 to 9 Months or Twins (35 to 42 weeks, 3rd Trimester) |
|
|---|---|---|---|---|
![]() Outside Height (outside surface through belly button) |
38cm (15in) |
43cm (16.9in) |
51cm (20in) |
58cm (22.8in) |
![]() Outside Width (outside surface, side to side) |
39cm (15.5in) |
47cm (18.5in) |
55cm (21.7in) |
66cm (26in) |
![]() Inside Height (inside surface next to wearer) |
36cm (14.2in) |
38cm (15in) |
42cm (16.5in) |
46cm (18.1in) |
![]() Inside Width (inside surface next to wearer) |
38cm (15in) |
38cm (15in) |
37cm (14.6in) |
44cm (17.3in) |
![]() Depth (through belly button) |
4cm (1.6in) |
8.5cm (3.3in) |
12cm (4.7in) |
16cm (6.3in) |
Weight |
0.6kg (1.3lb) |
1kg (2.2lb) |
1.4kg (3.1lb) |
2kg (4.4lb) |
Bodysuit Sizes
|
Your Size |
UK & ROI |
USA & Canada |
Germany & Scandinavia |
France, Spain & Portugal |
Italy |
Russia |
Australia |
Japan |
|---|---|---|---|---|---|---|---|---|
| XS | 4 | 2 | 30 | 32 | 36 | 38 | 6 | 5 |
| XS | 6 | 4 | 32 | 34 | 38 | 40 | 8 | 7 |
| S | 8 | 6 | 34 | 36 | 40 | 42 | 10 | 9 |
| S | 10 | 8 | 36 | 38 | 42 | 44 | 12 | 11 |
| M | 12 | 10 | 38 | 40 | 44 | 46 | 14 | 13 |
| M | 14 | 12 | 40 | 42 | 46 | 48 | 16 | 15 |
| L | 16 | 14 | 42 | 44 | 48 | 50 | 18 | 17 |
| L | 18 | 16 | 44 | 46 | 50 | 52 | 20 | 19 |
| XL | 20 | 18 | 46 | 48 | 52 | 54 | 22 | 21 |
| XL | 22 | 20 | 48 | 50 | 54 | 56 | 24 | 23 |
| XXL | 24 | 22 | 50 | 52 | 56 | 58 | 26 | 25 |
| XXL | 26 | 24 | 20 | 54 | 58 | 60 | 28 | 27 |
| Your Size | ![]() Under Bust |
![]() Waist |
![]() Hip |
|---|---|---|---|
| XS | 66 - 71cm (26 - 28in) |
61 - 66cm (24 - 26in) |
76 - 81cm (30 - 32in) |
| S | 76 - 81cm (30 - 32in) |
71 - 76cm (28 - 30in) |
86 - 91cm (34 - 36in) |
| M | 86 - 91cm (34 - 36in) |
81 - 86cm (32 - 34in) |
97 - 102cm (38 - 40in) |
| L | 97 - 102cm (38 - 40in) |
91 - 97cm (36 - 38in) |
107 - 112cm (42 - 44in) |
| XL | 107 - 112cm (42 - 44in) |
102 - 107cm (40 - 42in) |
117 - 122cm (46 - 48in) |
| XXL | 117 - 122cm (46 - 48in) |
112 - 117cm (44 - 46in) |
127 - 132cm (50 - 52in) |
If your measurement falls between bodysuit sizes we usually recommend selecting the larger of the two sizes.
Custom Skin Tone Matching
If you’re looking for a more personalised result, we offer a custom skin tone matching service for your silicone faux pregnant belly. Here’s how it works:
- Add Custom Matching to Your Order
When purchasing your silicone faux pregnant belly, simply select the Custom Colour Matching option. This lets our team know that you’d like us to blend a bespoke skin tone just for you.
- Receive Your Sample Pack
After your order is placed, we’ll post a Sample Pack to you containing real silicone swatches in all of our standard skin tones. These allow you to compare subtle undertones directly against your skin in natural light, helping to determine your ideal colour match.
When your Sample Pack is dispatched, we’ll also email you a link to our secure Custom Colour Match Upload Form, where you can easily submit your photos and colour preferences once the swatches arrive.
For delivery timeframes, please visit our Shipping page.
- Share Your Colour Match
Once you receive your Sample Pack, please visit the Custom Colour Match Upload Form using the link we emailed to you. The form will guide you step by step through submitting your swatch photos and details, helping us avoid mistakes and achieve the most natural, seamless colour match for your silicone faux pregnant belly.
Alternatively, if you prefer, you may email us the following information instead:
- Let us know which body area you'd like the faux pregnant belly to match most closely — for example, some clients prefer the tone of their belly to match their tummy, which is often lighter than other areas.
- Please specify which swatches appear in each image.
Once we’ve reviewed your swatch choices and photos, our in-studio team will:
- Hand-blend silicone pigments to craft your unique skin tone.
- Cure and test small silicone samples to check for tone accuracy.
- This custom pigment blending process usually takes 2–3 working days.
We will then begin production of your custom colour-matched faux pregnant belly. As soon as it’s ready, you’ll receive an email with tracking details for your parcel.
We retain a small batch of your custom-mixed pigment, so if you’d like to order another faux pregnant belly in the same shade later on, you’ll receive 50% off the colour matching service.
Questions?
We’re happy to help — just email us at info@moonbump.com.




