---
title: "momcozy s12 pro flange insert — Niche Verdict: Skip it (41/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/baby-products/momcozy-s12-pro-flange-insert"
last_updated: "2026-07-14T02:09:05.951Z"
locale: en
meta:
  description: "brand-locked demand (top 5 brands take 93% of clicks) — momcozy s12 pro flange insert doesn't clear our bar today."
  "og:description": "brand-locked demand (top 5 brands take 93% of clicks) — momcozy s12 pro flange insert doesn't clear our bar today."
  "og:title": "momcozy s12 pro flange insert — Niche Verdict: Skip it (41/100) | Amazon United States - Flapen"
---

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# **momcozy s12 pro flange insert**

**Skip it**

Brand-locked demand (top 5 brands take 93% of clicks) — this niche doesn't clear our bar today.

Market size 17Growth 18Conversion 64Competition 52Returns 49Price range 70Avg price 54Brand share 16Review moat 52Quality gap 58

**Price range**

**Good****$6.92–$34.29**

cheapest to priciest tracked listing — scored on the share inside $15–$100

**Conversion**

**Good****5.7%**

search→purchase rate — share of searches ending in a sale

**Quality gap**

**Good****4.4★**

avg incumbent rating — lower means beatable quality

**Avg price**

**Good****$12.44**

avg listing price — sweet spot $15–$100

**Competition**

**Good****54%**

top-5 click share — leaders hold, buyers still browse

**Review moat**

**Good****1,416.17**

avg incumbent reviews — the moat a new listing must climb

**Returns**

**Okay****3.1%**

return rate — above 6% kills the launch gate

**Growth**

**Bad****-14.0%**

90-day search growth — must beat 0% to launch

**Market size**

**Bad****$70K**

$70K/yr · 98K searches

**Brand share**

**Bad****93%**

top-5 brand share — brand-locked demand

## **Competition**

The top 5 products take 54% of clicks — established leaders, but buyers still shop beyond them.

**Brands**

**8 **▼falling

**Sellers**

**11**

**Top-5 brand share**

**93%**

**Open market**

**2%**

- Momcozy58% - Nursi Luna11% - IVARONAL10% - LOTBILL8% - Parner6% - Nuliie5% - Open — no brand owns it (2 brands, 2%)

## **Product shelf**

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

0%4%$3K8%$6K12%$8K16%$11K1001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 24 tracked products in this niche — three views at once, no toggling.

### **Top sellers**

by 90-day click share

[1![Momcozy M5| M6| M9 Original Replacement Accessories Food-Grade Silicone & BPA Free Original Breastfeeding Parts Inserts 19mm 4 Pack](https://m.media-amazon.com/images/I/31rpFdB5CzL.jpg)**Momcozy M5| M6| M9 Original Replacement Accessories Food-Grade Silicone & BPA Free Original Breastfeeding Parts Inserts 19mm 4 Pack**Momcozy**$14.04**4.3★2,611 rev](https://www.amazon.com/dp/B0FCXY8ZWL) [2![Momcozy M5| M6| M9 Original Replacement Accessories Food-Grade Silicone & BPA Free Original Breastfeeding Parts Inserts 15/17/19/21mm](https://m.media-amazon.com/images/I/31iKOD1KtLL.jpg)**Momcozy M5| M6| M9 Original Replacement Accessories Food-Grade Silicone & BPA Free Original Breastfeeding Parts Inserts 15/17/19/21mm**Momcozy**$14.02**4.3★2,611 rev](https://www.amazon.com/dp/B0FCY8919Y) [3![Momcozy Flange Insert 15/17/19/21mm Compatible with 24mm Flange/Shield of Most Pumps Fit for Momcozy S9Pro/S12Pro/S12Pro-Quick Replacement Accessories 4PCS](https://m.media-amazon.com/images/I/41E+T5c9zXL.jpg)**Momcozy Flange Insert 15/17/19/21mm Compatible with 24mm Flange/Shield of Most Pumps Fit for Momcozy S9Pro/S12Pro/S12Pro-Quick Replacement Accessories 4PCS**Momcozy**$11.98**4.3★1,166 rev](https://www.amazon.com/dp/B0G2WWP6Z4) [4![Flange Insert 13/15/17/19/21mm 10PCS Compatible with Momcozy S12 Pro/S9 Pro/S12/S9/Medela/Spectra etc Electric Breast Pump 24mm Flange/Shield Reduce 24mm Tunnel Down to Correct Size](https://m.media-amazon.com/images/I/41OcGg5lVUL.jpg)**Flange Insert 13/15/17/19/21mm 10PCS Compatible with Momcozy S12 Pro/S9 Pro/S12/S9/Medela/Spectra etc Electric Breast Pump 24mm Flange/Shield Reduce 24mm Tunnel Down to Correct Size**LOTBILL**$7.34**4.6★583 rev](https://www.amazon.com/dp/B0CL96VP1C) [5![Nursi Luna Flange Sizing Kit 3-in-1 with 13/15/17/19/21mm for 24mm Electric Breast Pump Flanges/Shields 10PCS Soft Silicone Flange Inserts for More Comfortable Pumping BPA-Free Essential for Moms](https://m.media-amazon.com/images/I/41TicDjnz7L.jpg)**Nursi Luna Flange Sizing Kit 3-in-1 with 13/15/17/19/21mm for 24mm Electric Breast Pump Flanges/Shields 10PCS Soft Silicone Flange Inserts for More Comfortable Pumping BPA-Free Essential for Moms**Nursi Luna**$9.87**4.6★2,081 rev](https://www.amazon.com/dp/B0CY81WHD5)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![Momcozy Flange Insert 21mm Compatible with 24mm Flange/Shield of Most Pumps Fit for Momcozy S9Pro/S12Pro/S12Pro-Quick Replacement Accessories 4PCS 21mm](https://m.media-amazon.com/images/I/41eLJKMOISL.jpg)**Momcozy Flange Insert 21mm Compatible with 24mm Flange/Shield of Most Pumps Fit for Momcozy S9Pro/S12Pro/S12Pro-Quick Replacement Accessories 4PCS 21mm**Momcozy**$11.91**1,166 rev4mo ago](https://www.amazon.com/dp/B0G2WWG345) [![Momcozy Flange Insert 19mm Compatible with 24mm Flange/Shield of Most Pumps Fit for Momcozy S9Pro/S12Pro/S12Pro-Quick Replacement Accessories 4PCS 19mm](https://m.media-amazon.com/images/I/41m1oOdl0oL.jpg)**Momcozy Flange Insert 19mm Compatible with 24mm Flange/Shield of Most Pumps Fit for Momcozy S9Pro/S12Pro/S12Pro-Quick Replacement Accessories 4PCS 19mm**Momcozy**$12.02**1,166 rev5mo ago](https://www.amazon.com/dp/B0G2WWRBDV) [![Momcozy Flange Insert 15mm Compatible with 24mm Flange/Shield of Most Pumps Fit for Momcozy S9Pro/S12Pro/S12Pro-Quick Replacement Accessories 4PCS 15mm](https://m.media-amazon.com/images/I/41HOKKO31fL.jpg)**Momcozy Flange Insert 15mm Compatible with 24mm Flange/Shield of Most Pumps Fit for Momcozy S9Pro/S12Pro/S12Pro-Quick Replacement Accessories 4PCS 15mm**Momcozy**$12.12**1,166 rev5mo ago](https://www.amazon.com/dp/B0G2WP5TMS) [![Momcozy Flange Insert 15/17/19/21mm Compatible with 24mm Flange/Shield of Most Pumps Fit for Momcozy S9Pro/S12Pro/S12Pro-Quick Replacement Accessories 4PCS](https://m.media-amazon.com/images/I/41E+T5c9zXL.jpg)**Momcozy Flange Insert 15/17/19/21mm Compatible with 24mm Flange/Shield of Most Pumps Fit for Momcozy S9Pro/S12Pro/S12Pro-Quick Replacement Accessories 4PCS**Momcozy**$11.98**1,166 rev5mo ago](https://www.amazon.com/dp/B0G2WWP6Z4) [![Momcozy Original Replacement Accessories for Upgraded Mobile Flow | Upgraded M9 Original Upgraded M9 Breastfeeding Parts 24mm Flange 1 Pack](https://m.media-amazon.com/images/I/31Mm6FLwDXL.jpg)**Momcozy Original Replacement Accessories for Upgraded Mobile Flow | Upgraded M9 Original Upgraded M9 Breastfeeding Parts 24mm Flange 1 Pack**Momcozy**$21.64**1,175 rev5mo ago](https://www.amazon.com/dp/B0G6CQBKH7)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![Momcozy Flange Insert 21mm Compatible with 24mm Flange/Shield of Most Pumps Fit for Momcozy S9Pro/S12Pro/S12Pro-Quick Replacement Accessories 4PCS 21mm](https://m.media-amazon.com/images/I/41eLJKMOISL.jpg)**Momcozy Flange Insert 21mm Compatible with 24mm Flange/Shield of Most Pumps Fit for Momcozy S9Pro/S12Pro/S12Pro-Quick Replacement Accessories 4PCS 21mm**Momcozy**$11.91**4.3★**▲ 171%**](https://www.amazon.com/dp/B0G2WWG345) [![Momcozy Pumping Bra for Wearable Breast Pump Nursing & Pumping Bra in One Hands Free Pump Bra Suitable for M5 S12 Pro etc Black](https://m.media-amazon.com/images/I/41JCXSVhcKL.jpg)**Momcozy Pumping Bra for Wearable Breast Pump Nursing & Pumping Bra in One Hands Free Pump Bra Suitable for M5 S12 Pro etc Black**Momcozy**$34.29**3.9★**▲ 164%**](https://www.amazon.com/dp/B0CT5PPW3V) [![Momcozy Original Replacement Accessories for Upgraded Mobile Flow | Upgraded M9 Original Upgraded M9 Breastfeeding Parts 24mm Flange 1 Pack](https://m.media-amazon.com/images/I/31Mm6FLwDXL.jpg)**Momcozy Original Replacement Accessories for Upgraded Mobile Flow | Upgraded M9 Original Upgraded M9 Breastfeeding Parts 24mm Flange 1 Pack**Momcozy**$21.64**4.4★**▲ 160%**](https://www.amazon.com/dp/B0G6CQBKH7) [![Momcozy M5| M6| M9 Original Replacement Accessories Food-Grade Silicone & BPA Free Original Breastfeeding Parts Inserts 17mm 4 Pack](https://m.media-amazon.com/images/I/31jaxOl8qpL.jpg)**Momcozy M5| M6| M9 Original Replacement Accessories Food-Grade Silicone & BPA Free Original Breastfeeding Parts Inserts 17mm 4 Pack**Momcozy**$14.20**4.3★**▲ 142%**](https://www.amazon.com/dp/B0FCXRNKB8) [![Momcozy Flange Insert 19mm Compatible with 24mm Flange/Shield of Most Pumps Fit for Momcozy S9Pro/S12Pro/S12Pro-Quick Replacement Accessories 4PCS 19mm](https://m.media-amazon.com/images/I/41m1oOdl0oL.jpg)**Momcozy Flange Insert 19mm Compatible with 24mm Flange/Shield of Most Pumps Fit for Momcozy S9Pro/S12Pro/S12Pro-Quick Replacement Accessories 4PCS 19mm**Momcozy**$12.02**4.3★**▲ 135%**](https://www.amazon.com/dp/B0G2WWRBDV)

**~~View all trending →~~**

## **Demand & seasonality**

Weekly Amazon search volume, last 102 weeks — -14.0% search growth over the last 90 days.

2K2KSpike '25Prime Day '25Spike '26 seasonDecMarJunAugNovMarMay

Peak months: Feb, Mar, Apr, May, Jun · busiest ÷ quietest = 4.7×

## **Reviews**

What buyers praise and complain about, mined from review topics.

### **What buyers love **

**Size-Overall**33%

*“Good variety of sizes”*

**Quality-Overall**13%

*“One thing that really stood out to me was how well-made”*

**Ease Of Use**10%

*“This made it so easy for me”*

**Comfort-Overall**8%

*“So comfortable”*

**Value For Money**8%

*“Good price”*

**Advertised Vs Actual Product**5%

*“As advertised”*

**Ease Of Cleaning**5%

*“The little cleaning sponge is wonderful”*

**Breastfeeding Friendly**4%

*“Very helpful and useful for breastfeeding”*

**Compatibility-Overall**3%

*“Compatible with Frida Mom manual pump”*

**Durability**2%

*“durable”*

### **What buyers complain about **

**Size-Overall**23%

*“Does NOT fit”*

**Durability**18%

*“Breaks easily”*

**Quality-Overall**8%

*“Poor quality”*

**Defective Material/Parts**6%

*“Part Breaks”*

**Value For Money**5%

*“The parts are expensive”*

**Compatibility-Overall**4%

*“Won't work with momcozy M9”*

**Comfort-Overall**4%

*“Very uncomfortable”*

**Product Condition**3%

*“Looks like it was opened previously”*

**Ease Of Cleaning**3%

*“they are kind of a pain to insert and clean and the output isnt as good as just using the correct size pump accessory”*

**Functionality-Overall**3%

*“Doesnt work for me”*

### **Top return reasons **

**Size-Overall**56%

**Defective Material/Parts**9%

**Functionality-Overall**7%

**Advertised Vs Actual Product**6%

**Material Quality**3%

**Value For Money**2%

**Comfort-Overall**2%

**Breastfeeding Friendly**2%

**Compatibility-Overall**2%

**Quality-Overall**2%