---
title: "Overnight Diapers Size 5 — $1.7M/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/baby-products/overnight-diapers-size-5"
last_updated: "2026-08-07T03:24:45.367Z"
locale: en
meta:
description: "Niche score 56/100 · $1.7M/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 56/100 · $1.7M/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Overnight Diapers Size 5 — $1.7M/yr Amazon US Niche (2026) - Flapen"
---
# **overnight diapers size 5**
**Worth a look**
Shows searches that convert (14.9% search→purchase), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 89Growth 24Conversion 97Competition 45Returns 96Price range 89Avg price 95Brand share 8Review moat 19Quality gap 23
**Conversion**
**Incredible****14.9%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Incredible****0.8%**
return rate — above 5% kills the launch gate
**Avg price**
**Incredible****$34.62**
avg listing price — sweet spot $15–$100
**Market size**
**Great****$1.7M**
$1.7M/yr · 324K searches
**Price range**
**Great****$9.86–$80.97**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Competition**
**Okay****58%**
top-5 click share — leaders hold, buyers still browse
**Growth**
**Bad****-2.4%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Bad****4.6★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Bad****15,455.08**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Bad****97%**
top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, overnight diapers size 5 is a $1.7M/yr Amazon United States market (324K searches/yr). The top 5 brands hold 97% of demand. Demand peaks in Aug. Verdict: Worth a look — 56/100.
Data updated Jul 20, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **overnight diapers size 5 market data**
- **Units sold / yr**
- **40K–50K**
- avg 2,000–2,500/product
- **Revenue / yr**
- **$1.4M–$1.7M**
- units × avg price
- **Conversion rate**
- **14.9%**
- **Avg BSR**
- **#31**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **88%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **51 months**
- **Avg seller age**
- **144 days**
## **Competition & brand share**
The top 5 products take 58% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**8 **▲rising
**Sellers**
**50**
**Top-5 brand share**
**97%**
Top 20: 100%
**Top-5 click share**
**58%**
Top 20: 94%
**Open market**
**2%**
- Pull-Ups43% - GoodNites42% - MooMoo Baby5% - Pampers4% - Ninjamas2% - FUVVRVAL1% - Open — no brand owns it (2 brands, 2%)
## **Demand & seasonality**
Weekly Amazon search volume, last 102 weeks — -2.4% search growth over the last 90 days.
10K6KHoliday '24Spike '25Prime Day '25Spike '26 seasonDecMarJunAugNovMarMay
Peak months: Aug · busiest ÷ quietest = 1.9×
[**Open Trend **](https://flapen.com/research/us/baby-products/overnight-diapers-size-5/trend)
## **Top overnight diapers size 5 search terms**
- **overnight diapers size 5**90K/yr-4.4%0.2% conv. - **night diapers size 5**32K/yr-7.2%0.3% conv. - **nighttime diapers size 5**26K/yr-7.9%0.2% conv. - **goodnites xs**27K/yr-7.8%16.0% conv. - **overnight pull ups 4t-5t**23K/yr-2.1%16.8% conv. - **size 5 overnight diapers**19K/yr+1.5%0.3% conv. - **night time diapers size 5**18K/yr+12.1%0.1% conv. - **nighttime pull ups 4t-5t**10K/yr+23.1%13.6% conv. - **overnight pull ups 2t-3t**12K/yr+8.1%10.7% conv. - **size 5 nighttime diapers**10K/yr+13.7%0.1% conv. [**All search terms **](https://flapen.com/research/us/baby-products/overnight-diapers-size-5/search-terms)
## **Top overnight diapers size 5 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%5%$83K10%$167K15%$250K20%$333K1101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)1 product missing review or click data not plotted
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Goodnites Boys Nighttime Bedwetting Underwear Size Extra Small (28-43 lbs) 44 Ct (2 Packs of 22) Packaging May Vary**GoodNites**$28.40**4.8★28,354 rev](https://www.amazon.com/dp/B01IQDZHSC) [2**Pull-Ups Boys Night-Time Potty Training Pants Size 4T-5T Overnight Training Underwear (38-50 lbs) 52 Ct**Pull-Ups**$28.02**4.7★11,204 rev](https://www.amazon.com/dp/B0CQ8SJYQV) [3**Pull-Ups Girls Night-Time Potty Training Pants Size 4T-5T Overnight Training Underwear (38-50 lbs) 52 Ct**Pull-Ups**$28.09**4.7★7,937 rev](https://www.amazon.com/dp/B0CQ8S4G25) [4**Goodnites Girls Nighttime Bedwetting Underwear Size Extra Small (28-43 lbs) 44 Ct (2 Packs of 22) Packaging May Vary**GoodNites**$28.54**4.8★17,416 rev](https://www.amazon.com/dp/B015459WGS) [5**Goodnites Nighttime Bedwetting Underwear Boys XS (28-43 lb.) 99 Ct (3 Packs of 33) Packaging May Vary**GoodNites**$59.41**4.8★28,354 rev](https://www.amazon.com/dp/B0977HSB5Z)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Upairy Potty Training Pants Cotton Absorbent Training Underwear for Toddler Boy and Girls 2T-5T Soft Absorbent & Leak-Proof with Characters(4PCS S)**YIKG**$23.98**2 rev3mo ago](https://www.amazon.com/dp/B0GY15NKV3) [**Pull-Ups Boys Night-Time Potty Training Pants Size 4T-5T Overnight Training Underwear (38-50 lbs) 92 Ct**Pull-Ups**$48.65**11,204 rev8mo ago](https://www.amazon.com/dp/B0FRQLHBF4) [**Pull-Ups Girls Night-Time Potty Training Pants Size 4T-5T Overnight Training Underwear (38-50 lbs) 92 Ct**Pull-Ups**$48.47**7,937 rev8mo ago](https://www.amazon.com/dp/B0FRQ7M74G) [**Boys Incontinence Underwear Leakproof Daily & Nighttime Bedwetting Briefs**FUVVRVAL**$31.95**68 rev10mo ago](https://www.amazon.com/dp/B0FJ8VP7VQ) [**Pull-Ups Boys Night-Time Potty Training Pants Size 4T-5T Overnight Training Underwear (38-50 lbs) 52 Ct**Pull-Ups**$28.02**11,204 rev2y ago](https://www.amazon.com/dp/B0CQ8SJYQV)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Upairy Potty Training Pants Cotton Absorbent Training Underwear for Toddler Boy and Girls 2T-5T Soft Absorbent & Leak-Proof with Characters(4PCS S)**YIKG**$23.98**4.5★**▲ 352%**](https://www.amazon.com/dp/B0GY15NKV3) [**MooMoo Baby Training Underwear for Boys and Girls Absorbent Toddler Training Pants Cotton Washable and Reusable 2T-7T 8 Packs**MooMoo Baby**$31.26**4.5★**▲ 345%**](https://www.amazon.com/dp/B0B4DHCHZF) [**MooMoo Baby Training Underwear for Boys and Girls 8 Packs Absorbent Toddler Training Pants for Boys and Girls 6T**MooMoo Baby**$29.87**4.5★**▲ 343%**](https://www.amazon.com/dp/B0C69RKHZH) [**Boys Incontinence Underwear Leakproof Daily & Nighttime Bedwetting Briefs**FUVVRVAL**$31.95**3.7★**▲ 336%**](https://www.amazon.com/dp/B0FJ8VP7VQ) [**MooMoo Baby Training Underwear for Boys and Girls Absorbent Toddler Training Pants Cotton Washable and Reusable 2T-7T 8 Packs**MooMoo Baby**$31.39**4.5★**▲ 332%**](https://www.amazon.com/dp/B0B4DGKLBP)
**~~View all trending →~~**
## **What buyers say about overnight diapers size 5**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Leak-Proof**18%
*“No leaks”*
**Quality-Overall**11%
*“High Quality Premium Pull-up that you can Depend On”*
**Size-Overall**11%
*“they fit comfortably”*
**Sleep Quality**7%
*“Excellent product my grandbaby sleeps all night now”*
**Comfort-Overall**6%
*“Very comfy”*
**Design-Overall**5%
*“The design is cute”*
**Soft Feel**4%
*“softer material which seemed to be more comfortable”*
**Allergies**3%
*“Gentle and no irritation for kids”*
**Absorbency**3%
*“Very Absorbent”*
**Ease Of Use**3%
*“Easy to use”*
### **What buyers complain about **
**Leak-Proof**32%
*“they leak”*
**Smell**8%
*“AWFUL SMELL”*
**Value For Money**6%
*“Its expensive”*
**Absorbency**5%
*“Not absorbent”*
**Advertised Vs Actual Product**4%
*“FALSE ADVERTISING”*
**Size-Overall**3%
*“fit narrow”*
**Allergies**3%
*“Diaper caused Rash”*
**Moist/Dry**3%
*“still wets during the night”*
**Adhesion/Stickiness**2%
*“also they are not as sticky as I would have hoped”*
**Sleep Quality**2%
*“Would not recommend for night time”*
### **Top return reasons **
**Size-Overall**70%
**Leak-Proof**6%
**Advertised Vs Actual Product**5%
**Age Suitability**3%
**Absorbency**3%
**Value For Money**3%
**Smell**2%
**Functionality-Overall**2%
**Comfort-Overall**1%
**Material Quality**1%
## **Common questions**
- **Is overnight diapers size 5 profitable to sell on Amazon United States?**
- The niche generates $1.7M/yr across 26 tracked products. 5 of 5 products launched in the last 360 days are still selling. 90-day search growth is -2.4%. Flapen's verdict: Worth a look (56/100).
- **How competitive is the overnight diapers size 5 niche?**
- 8 brands and 50 sellers compete. The top 5 products take 58% of clicks and top 5 brands hold 97% of demand.
- **What do buyers complain about in overnight diapers size 5?**
- Top complaints mined from reviews: Leak-Proof, Smell, Value For Money. The return rate is 0.8%.
- **When does demand for overnight diapers size 5 peak?**
- Demand peaks in Aug; the busiest month runs 1.9× the quietest.
- **What does it cost to enter the overnight diapers size 5 niche?**
- Listings span $9.86–$80.97; the average listing price is $34.62 (sweet spot $15–$100). The average incumbent carries 15,455 reviews — the moat a new listing must climb.
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