---
title: "Momcozy S12 Pro Flange Insert — $70K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/baby-products/momcozy-s12-pro-flange-insert"
last_updated: "2026-08-08T10:06:53.498Z"
locale: en
meta:
description: "Niche score 41/100 · $70K/yr market · 98K searches/yr · $12.44 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 41/100 · $70K/yr market · 98K searches/yr · $12.44 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Momcozy S12 Pro Flange Insert — $70K/yr Amazon US Niche (2026) - Flapen"
---
# **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 48Price 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 5% 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
According to Flapen's Amazon United States niche tracking, momcozy s12 pro flange insert is a $70K/yr Amazon United States market (98K searches/yr). The top 5 brands hold 93% of demand. Demand peaks in Feb–Mar–Apr–May–Jun. Verdict: Skip it — 41/100.
Data updated Jul 12, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **momcozy s12 pro flange insert market data**
- **Units sold / yr**
- **6K–8K**
- avg 250–500/product
- **Revenue / yr**
- **$75K–$100K**
- units × avg price
- **Conversion rate**
- **5.7%**
- **Avg BSR**
- **#38**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **92%**
- **Out of stock**
- **14.4%**
- **Avg brand age**
- **29 months**
- **Avg seller age**
- **250 days**
## **Competition & brand share**
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%**
Top 20: 100%
**Top-5 click share**
**54%**
Top 20: 96%
**Open market**
**2%**
- Momcozy58% - Nursi Luna11% - IVARONAL10% - LOTBILL8% - Parner6% - Nuliie5% - Open — no brand owns it (2 brands, 2%)
## **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×
[**Open Trend **](https://flapen.com/research/us/baby-products/momcozy-s12-pro-flange-insert/trend)
## **Top momcozy s12 pro flange insert search terms**
- **momcozy flange inserts**38K/yr-13.7%4.9% conv. - **mom cozy flange inserts**16K/yr-10.9%5.1% conv. - **momcozy flange**10K/yr-17.4%5.3% conv. - **momcozy s12 pro flange**8K/yr-9.3%7.0% conv. - **momcozy flange inserts 21mm**5K/yr-12.8%16.4% conv. - **momcozy flanges**4K/yr-5.7%4.0% conv. - **momcozy inserts**3K/yr-15.5%5.2% conv. - **momcozy 21mm flange insert**3K/yr-23.8%21.2% conv. - **mom cozy s12 pro flange inserts**2K/yr-10.3%9.3% conv. - **momcozy s12 pro flange insert**5K/yr-34.4%8.3% conv. [**All search terms **](https://flapen.com/research/us/baby-products/momcozy-s12-pro-flange-insert/search-terms)
## **Top momcozy s12 pro flange insert products on Amazon**
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**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**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**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**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**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**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**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**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**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**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**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**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**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**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**Momcozy**$12.02**4.3★**▲ 135%**](https://www.amazon.com/dp/B0G2WWRBDV)
**~~View all trending →~~**
## **What buyers say about momcozy s12 pro flange insert**
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%
## **Common questions**
- **Is momcozy s12 pro flange insert profitable to sell on Amazon United States?**
- The niche generates $70K/yr across 24 tracked products. 7 of 9 products launched in the last 360 days are still selling. 90-day search growth is -14.0%. Flapen's verdict: Skip it (41/100).
- **How competitive is the momcozy s12 pro flange insert niche?**
- 8 brands and 11 sellers compete. The top 5 products take 54% of clicks and top 5 brands hold 93% of demand.
- **What do buyers complain about in momcozy s12 pro flange insert?**
- Top complaints mined from reviews: Size-Overall, Durability, Quality-Overall. The return rate is 3.1%.
- **When does demand for momcozy s12 pro flange insert peak?**
- Demand peaks in Feb–Mar–Apr–May–Jun; the busiest month runs 4.7× the quietest.
- **What does it cost to enter the momcozy s12 pro flange insert niche?**
- Listings span $6.92–$34.29; the average listing price is $12.44 (sweet spot $15–$100). The average incumbent carries 1,416 reviews — the moat a new listing must climb.
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