---
title: "18 Month Girl Halloween Costume — $0/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/clothing-shoes-jewelry/18-month-girl-halloween-costume"
last_updated: "2026-08-09T00:43:17.453Z"
locale: en
meta:
description: "Niche score 37/100 · $0/yr market · 198K searches/yr · $22.39 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 37/100 · $0/yr market · 198K searches/yr · $22.39 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "18 Month Girl Halloween Costume — $0/yr Amazon US Niche (2026) - Flapen"
---
# **18 month girl halloween costume**
**Skip it**
A small market ($0/yr) — this niche doesn't clear our bar today.
Market size 0Growth 14Conversion 0Competition 59Returns 24Price range 92Avg price 93Brand share 91Review moat 54Quality gap 27
**Avg price**
**Great****$22.39**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$14.02–$44.88**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Brand share**
**Great****44%**
top-5 brand share — no brand owns this niche
**Competition**
**Good****50%**
top-5 click share — leaders hold, buyers still browse
**Review moat**
**Good****1,332.79**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Returns**
**Bad****5.4%**
return rate — above 5% kills the launch gate
**Growth**
**Bad****-21.2%**
90-day search growth — must beat 0% to launch
**Market size**
**Bad****$0**
$0/yr · 198K searches
**Conversion**
**Bad****0.0%**
search→purchase rate — share of searches ending in a sale
**Signals**[** No Dominant Brand**](https://flapen.com/research/niches?market=us&signal=no_dominant_brand "Top brand's click share < 20%") [** 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, 18 month girl halloween costume is a $0/yr Amazon United States market (198K searches/yr). The top 5 brands hold 44% of demand. Demand peaks in Sep–Oct. Verdict: Skip it — 37/100.
Data updated Jul 10, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **18 month girl halloween costume market data**
- **Units sold / yr**
- **750–1K**
- avg 0–100/product
- **Revenue / yr**
- **$17K–$22K**
- units × avg price
- **Conversion rate**
- **0.0%**
- **Avg BSR**
- **#341**
- **Page quality**
- **0%**
- **Prime**
- **95%**
- **Sponsored**
- **84%**
- **Out of stock**
- **7.5%**
- **Avg brand age**
- **43 months**
- **Avg seller age**
- **180 days**
## **Competition & brand share**
The top 5 products take 50% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**18 **▲rising
**Sellers**
**21**
**Top-5 brand share**
**44%**
Top 20: 100%
**Top-5 click share**
**50%**
Top 20: 100%
**Open market**
**50%**
- Yruiz13% - Saliuentm9% - Fun Costumes9% - Thorn Tree7% - IMEKIS7% - Gakizon6%
## **Demand & seasonality**
Weekly Amazon search volume, last 92 weeks — -21.2% search growth over the last 90 days.
50K30KSpike '24Spike '25Spike '26 seasonAugSepOctNovJanMarAprJunJulAugSepOctNovDecJanMarAprMayJun
Peak months: Sep, Oct · busiest ÷ quietest = 361.6×
[**Open Trend **](https://flapen.com/research/us/clothing-shoes-jewelry/18-month-girl-halloween-costume/trend)
## **Top 18 month girl halloween costume search terms**
- **baby costumes 18-24 months**12K/yr-21.2%0.0% conv. - **one year old halloween costume girl**15K/yr+30.5%0.0% conv. - **one year old halloween costume boy**14K/yr+101.0%0.0% conv. - **1 year old boy costume**6K/yr-7.9%0.0% conv. - **18 month girl halloween costume**26K/yr+112.7%0.0% conv. - **18 month girl costume**11K/yr-60.9%0.0% conv. - **1 year old costume girl**9K/yr-52.2%0.0% conv. - **18 month boy costume**9K/yr-68.8%0.0% conv. - **18 month costume girl**11K/yr-41.8%0.0% conv. - **18 month old costume**7K/yr-60.9%0.0% conv. [**All search terms **](https://flapen.com/research/us/clothing-shoes-jewelry/18-month-girl-halloween-costume/search-terms)
## **Top 18 month girl halloween 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%4%$08%$012%$016%$0101001K10K100K 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**Yruiz Newborn Baby Girl Halloween Cowgirl Costume Romper Dress Outfits Skirt Set Birthday Bodysuit With Headband18-24 Months**Yruiz**$18.62**3.9★10 rev](https://www.amazon.com/dp/B0F53KSTJB) [2**Saliuentm Toddler Girl Halloween Outfits Long Sleeve Romper Onesie Bee Suspender Skirt Dress My First Halloween Baby Girl Outfit (B-Yellow 12-18 Months)**Saliuentm**$19.03**4.7★225 rev](https://www.amazon.com/dp/B0D96439SH) [3**Fun Costumes Infant Girl Bat Halloween Costume | Baby Pink Vampire Bat Hooded Bodysuit with Wings 0/3 Months**Fun Costumes**$44.88**4.7★266 rev](https://www.amazon.com/dp/B09HCV2Z8H) [4**Thorn Tree Kids Firefighter Outfit Short Sleeve T-Shirt Suspender Pants Overalls Halloween Birthday Outfits (Blue 18-24 Months)**Thorn Tree**$17.31**4.7★167 rev](https://www.amazon.com/dp/B0FMYB6N25) [5**Gakizon Baby Boy Halloween outfits Infant baby Toddler Boy Chucky Outfit Good guy Outfits**Gakizon**$35.92**4.6★256 rev](https://www.amazon.com/dp/B0D8ZPZ9HK)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Thorn Tree Kids Firefighter Outfit Short Sleeve T-Shirt Suspender Pants Overalls Halloween Birthday Outfits (Blue 18-24 Months)**Thorn Tree**$17.31**167 rev10mo ago](https://www.amazon.com/dp/B0FMYB6N25) [**Xuomuen Cowboy Costume Romper with Brown sheriff Hat Baby Dress Up Outfit Yellow and Blue 18-24 Months**Xuomuen**$19.41**121 rev11mo ago](https://www.amazon.com/dp/B0F3WXG48T) [**Baby Boy Girl Dinosaur Costume Cute Sleeveless Romper with Hat Newborn Infant Halloween Cosplay Clothes (Emerald 6-12 Months)**Dcohmch**$19.56**167 rev1y ago](https://www.amazon.com/dp/B0FFGTHML9) [**Madjtlqy Baby Halloween Costumes Toddler Girl Boy Fruit Outfits Clothes Hooded Romper Jumpsuit With Long Socks (Blueberry 6-12 Months)**Madjtlqy**$17.10**24 rev1y ago](https://www.amazon.com/dp/B0FF4Y5256) [**Rarjuiey Halloween Toddler Girl Outfit Boo Romper Spaghetti Strap Ghost Jumpsuit Bell Bottoms Outfits Spooky Clothes (Boo Ghost Black 18-24 Months)**Rarjuiey**$16.91**141 rev1y ago](https://www.amazon.com/dp/B0FBRSGHC7)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Highnesson-ww Baby Boy Funny First Birthday Clothes Infant Clothes Bow Tie Blue Romper Pants Set Suspenders Cake Smash Outfits**Highnesson-ww**$19.18**4.6★**▲ 325%**](https://www.amazon.com/dp/B0C81Z7PW9) [**Yruiz Newborn Baby Girl Halloween Cowgirl Costume Romper Dress Outfits Skirt Set Birthday Bodysuit With Headband18-24 Months**Yruiz**$18.62**3.9★**▲ 308%**](https://www.amazon.com/dp/B0F53KSTJB) [**IBTOM CASTLE Baby Boys Wild One Birthday Outfit Jungle Forest Explorer Shirt + Shorts + Hat + Bandana Safari First Birthday Zoo Party Cake Smash Photoshoot Dress Clothes Khaki 12-18 Months**IBTOM CASTLE**$28.69**4.5★**▲ 295%**](https://www.amazon.com/dp/B0F6YPBZQN) [**Marvel Avengers Captain America Infant Baby Boys Cosplay Romper Blue 18 Months**Marvel**$17.83**4.8★**▲ 284%**](https://www.amazon.com/dp/B0C82TR6HS) [**WZTYYDS Baby Girl First Birthday Outfit In My One Year Old Era Top Short Sleeve 1st Birthday Shirt + Casual Shorts Set (Pink 12-18 Months)**WZTYYDS**$14.02**4.7★**▲ 269%**](https://www.amazon.com/dp/B0DRNMQM9V)
**~~View all trending →~~**
## **What buyers say about 18 month girl halloween costume**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**44%
*“Good fit”*
**Advertised Vs Actual Product**9%
*“is accurate to the picture”*
**Soft Feel**8%
*“Soft and pictures shown are accurate”*
**Quality-Overall**8%
*“Good quality”*
**Comfort-Overall**8%
*“Perfect fit and comfy”*
**Color**6%
*“Color is perfect”*
**Ease Of Use**5%
*“Easy to get on & off”*
**Weight Light**2%
*“My son loves wearing it its easy to put on and lightweight”*
**Washability**2%
*“Good material, Ive washed twice since I bought it and still look great”*
**Value For Money**2%
*“was a good price for such a high quality costume”*
### **What buyers complain about **
**Size-Overall**31%
*“It was a little big”*
**Product Condition**19%
*“Wont come new”*
**Material Quality**13%
*“Not at all what I expected material is clingy”*
**Smell**13%
*“Smelled awful”*
**Length**6%
*“A little long on my 22 month old”*
**Value For Money**6%
*“Not worth the price”*
### **Top return reasons **
**Size-Overall**72%
**Length**10%
**Material Quality**5%
**Color**2%
**Advertised Vs Actual Product**2%
**Quality-Overall**2%
**Chest Fit**1%
**Product Condition**1%
**Waist Fit**1%
**Sleeve Fit**1%
## **Common questions**
- **Is 18 month girl halloween 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 -21.2%. Flapen's verdict: Skip it (37/100).
- **How competitive is the 18 month girl halloween costume niche?**
- 18 brands and 21 sellers compete. The top 5 products take 50% of clicks and top 5 brands hold 44% of demand.
- **What do buyers complain about in 18 month girl halloween costume?**
- Top complaints mined from reviews: Size-Overall, Product Condition, Material Quality. The return rate is 5.4% — above our launch gate.
- **When does demand for 18 month girl halloween costume peak?**
- Demand peaks in Sep–Oct; the busiest month runs 361.6× the quietest.
- **What does it cost to enter the 18 month girl halloween costume niche?**
- Listings span $14.02–$44.88; the average listing price is $22.39 (sweet spot $15–$100). The average incumbent carries 1,333 reviews — the moat a new listing must climb.
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