---
title: "Baby Monster Costume — $0/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/clothing-shoes-jewelry/baby-monster-costume"
last_updated: "2026-08-09T12:33:06.185Z"
locale: en
meta:
description: "Niche score 31/100 · $0/yr market · 71K searches/yr · $23.97 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 31/100 · $0/yr market · 71K searches/yr · $23.97 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Baby Monster Costume — $0/yr Amazon US Niche (2026) - Flapen"
---
# **baby monster costume**
**Skip it**
A small market ($0/yr) — this niche doesn't clear our bar today.
Market size 0Growth 44Conversion 0Competition 28Returns 0Price range 93Avg price 95Brand share 43Review moat 79Quality gap 20
**Avg price**
**Incredible****$23.97**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$14.13–$53.01**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Great****420.58**
avg incumbent reviews — the moat a new listing must climb
**Growth**
**Okay****+15.4%**
90-day search growth — must beat 0% to launch
**Brand share**
**Okay****79%**
top-5 brand share — brands hold most of the demand
**Competition**
**Okay****68%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Market size**
**Bad****$0**
$0/yr · 71K searches
**Conversion**
**Bad****0.0%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Bad****12.0%**
return rate — above 5% kills the launch gate
**Signals**[** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500") [** High Returns**](https://flapen.com/research/niches?market=us&signal=high_returns "Return rate > 5%")
According to Flapen's Amazon United States niche tracking, baby monster costume is a $0/yr Amazon United States market (71K searches/yr). The top 5 brands hold 79% of demand. Demand peaks in Sep–Oct. Verdict: Skip it — 31/100.
Data updated Jul 10, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **baby monster costume market data**
- **Units sold / yr**
- **500–750**
- avg 0–100/product
- **Revenue / yr**
- **$12K–$18K**
- units × avg price
- **Conversion rate**
- **0.0%**
- **Avg BSR**
- **#1,295**
- **Page quality**
- **0%**
- **Prime**
- **95%**
- **Sponsored**
- **63%**
- **Out of stock**
- **9.5%**
- **Avg brand age**
- **31 months**
- **Avg seller age**
- **195 days**
## **Competition & brand share**
The top 5 products take 68% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**11 **▼falling
**Sellers**
**34**
**Top-5 brand share**
**79%**
Top 20: 100%
**Top-5 click share**
**68%**
Top 20: 100%
**Open market**
**16%**
- Thorn Tree28% - Disney18% - QSTYLE15% - MUST ROSE SPORTS AND HOMEWEAR9% - SCOPUCI9% - FEIBEL5% - Open — no brand owns it (5 brands, 16%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +15.4% search growth over the last 90 days.
45K35KSpike '24Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Sep, Oct · busiest ÷ quietest = 190.4×
[**Open Trend **](https://flapen.com/research/us/clothing-shoes-jewelry/baby-monster-costume/trend)
## **Top baby monster costume search terms**
- **sully costume toddler**32K/yr+47.0%0.6% conv. - **sully toddler costume**9K/yr+45.6%0.3% conv. - **toddler sully costume**11K/yr+23.6%0.0% conv. - **sully monsters inc costume toddler**14K/yr-59.0%0.0% conv. - **sulley costume toddler**6K/yr-54.0%0.0% conv. [**All search terms **](https://flapen.com/research/us/clothing-shoes-jewelry/baby-monster-costume/search-terms)
## **Top baby monster costume 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%10%$020%$030%$040%$0101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 19 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Thorn Tree Toddler Baby Boys Halloween Clothes Set Animal Costumes Outfits 2Pcs Velvet Pants Set (Blue 3-4 Years)**Thorn Tree**$25.02**4.6★49 rev](https://www.amazon.com/dp/B0DGLH8DGL) [2**Unisex Baby Flannel Romper Animal Onesie For Toddler Costume Hooded Cartoon Outfit**QSTYLE**$26.12**4.5★174 rev](https://www.amazon.com/dp/B0FCFQP9WN) [3**MUST ROSE SPORTS AND HOMEWEAR Unisex Baby Flannel Romper Animal Onesie Costume Hooded Cartoon Outfit Suit (horns 90(12-17M)**MUST ROSE SPORTS AND HOMEWEAR**$24.67**4.8★2,515 rev](https://www.amazon.com/dp/B0CJ4L5BX6) [4**SCOPUCI Unisex Baby Animal Onesie Pajamas Infant Flannel Halloween Cosplay Costume Toddler Christmas Homewear/Sleepwear**SCOPUCI**$23.83**4.8★382 rev](https://www.amazon.com/dp/B0CM5P81CM) [5**Disney Monsters Inc Boys Costume Zip Up Hooded Coverall for Newborn Infant and Toddler Blue or Green**Disney**$14.13**4.6★331 rev](https://www.amazon.com/dp/B08W1V21P6)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Disney Pixar Monsters Inc Dress Up to Play Zip-Up Hooded Coverall for Kids with 3D Horns Sulley (Blue 3T)**Disney**$20.11**34 rev5mo ago](https://www.amazon.com/dp/B0GLM93Z24) [**Disney Pixar Monsters Inc Dress Up to Play Zip-Up Hooded Coverall for Kids with 3D Horns Mike Wazowski (Green 4T)**Disney**$19.71**34 rev5mo ago](https://www.amazon.com/dp/B0GLM4SNT5) [**Unisex Baby Flannel Romper Animal Onesie For Toddler Costume Hooded Cartoon Outfit**QSTYLE**$26.12**174 rev1y ago](https://www.amazon.com/dp/B0FCFQP9WN) [**GUEMONG Baby Boy Girl Animal Holloween Cosplay Costume Hooded Romper Jumpsuit Costume Outfit (Blue 4-5 Years)**GUEMONG**$28.19**28 rev1y ago](https://www.amazon.com/dp/B0DYKBPH5Q) [**Thorn Tree Toddler Baby Boys Halloween Clothes Set Animal Costumes Outfits 2Pcs Velvet Pants Set (Blue 3-4 Years)**Thorn Tree**$25.02**49 rev1y ago](https://www.amazon.com/dp/B0DGLH8DGL)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Disney Pixar Monsters Inc Dress Up to Play Zip-Up Hooded Coverall for Kids with 3D Horns Mike Wazowski (Green 4T)**Disney**$19.71**4.9★**▲ 1000%**](https://www.amazon.com/dp/B0GLM4SNT5) [**Disney Monsters Inc. Mike Sully Toddler Boys Hooded T-Shirt and French Terry Shorts Outfit Set Sulley Mike 4T**Disney**$24.19**4.7★**▲ 1000%**](https://www.amazon.com/dp/B0CQZ7Y3CT) [**Disney Pixar Monsters Inc Dress Up to Play Zip-Up Hooded Coverall for Kids with 3D Horns Sulley (Blue 3T)**Disney**$20.11**4.9★**▲ 1000%**](https://www.amazon.com/dp/B0GLM93Z24) [**Disney Monsters Inc. Mike Sully Toddler Boys Hooded T-Shirt and French Terry Shorts Outfit Set Sulley Mike 5T**Disney**$24.29**4.7★**▲ 1000%**](https://www.amazon.com/dp/B0CQZ6MKD9) [**GUEMONG Baby Boy Girl Animal Holloween Cosplay Costume Hooded Romper Jumpsuit Costume Outfit (Blue 4-5 Years)**GUEMONG**$28.19**4.8★**▲ 1000%**](https://www.amazon.com/dp/B0DYKBPH5Q)
**~~View all trending →~~**
## **What buyers say about baby monster costume**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**17%
*“fits perfectly”*
**Warmth**16%
*“kept my daughter warm on Halloween”*
**Material Quality**11%
*“stuffed animal-like material”*
**Quality-Overall**8%
*“its so well made”*
**Comfort-Overall**7%
*“comfortable”*
**Value For Money**7%
*“decent value”*
**Soft Feel**6%
*“Soft”*
**Fun/Entertainment Experience**6%
*“Granddaughter really loves playing dress up”*
**Washability**5%
*“It came out of the wash looking good”*
**Thickness**2%
*“thick good material for the cold weather size was spot on”*
### **What buyers complain about **
**Size-Overall**25%
*“small”*
**Warmth**20%
*“But be aware its super hot”*
**Quality-Overall**7%
*“which isn't as good as 100%”*
**Thin**5%
*“The fabric reminds me of a thin sweatshirt”*
### **Top return reasons **
**Size-Overall**70%
**Length**4%
**Sleeve Fit**4%
**Product Condition**4%
**Advertised Vs Actual Product**4%
**Thin**2%
**Gap/Hole**2%
**Chest Fit**2%
**Value For Money**2%
**Quality-Overall**2%
## **Common questions**
- **Is baby monster costume profitable to sell on Amazon United States?**
- The niche generates $0/yr across 19 tracked products. 0 of 2 products launched in the last 360 days are still selling. 90-day search growth is +15.4%. Flapen's verdict: Skip it (31/100).
- **How competitive is the baby monster costume niche?**
- 11 brands and 34 sellers compete. The top 5 products take 68% of clicks and top 5 brands hold 79% of demand.
- **What do buyers complain about in baby monster costume?**
- Top complaints mined from reviews: Size-Overall, Warmth, Quality-Overall. The return rate is 12.0% — above our launch gate.
- **When does demand for baby monster costume peak?**
- Demand peaks in Sep–Oct; the busiest month runs 190.4× the quietest.
- **What does it cost to enter the baby monster costume niche?**
- Listings span $14.13–$53.01; the average listing price is $23.97 (sweet spot $15–$100). The average incumbent carries 421 reviews — the moat a new listing must climb.
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