overnight diapers size 4
Worth a lookShows searches that convert (15.3% search→purchase), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Conversion
Incredible15.3%search→purchase rate — share of searches ending in a sale
Returns
Incredible0.7%return rate — above 5% kills the launch gate
Avg price
Incredible$27.32avg listing price — sweet spot $15–$100
Price range
Great$9.86–$51.35cheapest to priciest tracked listing — scored on the share inside $15–$100
Market size
Great$968K$968K/yr · 231K searches
Quality gap
Good4.4★avg incumbent rating — lower means beatable quality
Brand share
Okay86%top-5 brand share — brands hold most of the demand
Growth
Bad-6.0%90-day search growth — must beat 0% to launch
Competition
Bad75%top-5 click share — a locked-up shelf
Review moat
Bad24,933.43avg incumbent reviews — the moat a new listing must climb
According to Flapen's Amazon United States niche tracking, overnight diapers size 4 is a $968K/yr Amazon United States market (231K searches/yr). The top 5 brands hold 86% of demand. Verdict: Worth a look — 56/100.
Data updated Jul 12, 2026 · scored weekly · How we score niches
overnight diapers size 4 market data
- Units sold / yr
- 30K–40K
- avg 3,000–4,000/product
- Revenue / yr
- $820K–$1.1M
- units × avg price
- Conversion rate
- 15.3%
- Avg BSR
- #72
- Page quality
- 0%
- Prime
- 93%
- Sponsored
- 86%
- Out of stock
- 0.0%
- Avg brand age
- 47 months
- Avg seller age
- 136 days
Competition & brand share
The top 5 products capture 75% of clicks — a locked-up shelf that new listings rarely crack.Brands
9 rising
Sellers
61
Top-5 brand share
86%
Top 20: 100%
Top-5 click share
75%
Top 20: 100%
Open market
10%
- Hello Bello48%
- Mama Bear18%
- The Honest Company7%
- Pull-Ups7%
- Pampers6%
- Select Kids5%
- Open — no brand owns it (3 brands, 10%)
Demand & seasonality
Weekly Amazon search volume, last 102 weeks — -6.0% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.8×
Top overnight diapers size 4 search terms
- overnight diapers size 479K/yr
- hello bello diapers size 437K/yr
- night diapers size 428K/yr
- nighttime diapers size 422K/yr
- size 4 overnight diapers19K/yr
- hello bello size 410K/yr
- size 4 nighttime diapers9K/yr
- night time diapers size 47K/yr
- hello bello size 4 diapers7K/yr
- sleep diapers size 42K/yr
Top overnight diapers size 4 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.
All 14 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Hello Bello Premium Overnight Baby Diapers Size 4 21 Count Unisex Ultra Absorbent and Soft Disposable Diapers for Babies and Toddlers
Hello Bello$15.863.8★711 rev
Amazon Brand - Mama Bear Gentle Touch Diapers Size 4 37 Count Hypoallergenic Leak Protection Wetness Indicator Stretchy Waistband Skin Safe
Mama Bear$10.614.2★60,652 rev
Amazon Brand - Mama Bear Gentle Touch Baby Diapers Formulated without Fragrance Size 4 148 Count (4 packs of 37) with Skin Protection and Leak Protection
Mama Bear$31.224.2★60,652 rev
The Honest Company Comfort Dry Disposable Daytime Diapers for Sensitive Skin Hypoallergenic Wild Thang + All The Alpacas Super Club Box Size 4 (2237 lbs) 104 Count
The Honest Company$47.564.0★1,762 rev
Pull-Ups Boys Night-Time Potty Training Pants Size 4T-5T Overnight Training Underwear (38-50 lbs) 52 Ct
Pull-Ups$28.014.7★11,205 rev
Newest
by launch date
Pampers Amore Size 4 (15-34 lbs) 58 Count Our Best Diaper Hypoallergenic & Fragrance Free Up to 100% Leakproof Soft as Cashmere
Pampers$26.46450 rev
Huggies Size 4 Diapers Little Movers Baby Diapers Size 4 (22-37 lbs) 150 Count (6 Packs of 25) Packaging May Vary
HUGGIES$51.3546,925 rev
Pull-Ups Boys Night-Time Potty Training Pants Size 4T-5T Overnight Training Underwear (38-50 lbs) 52 Ct
Pull-Ups$28.0111,205 rev
Pull-Ups Girls Night-Time Potty Training Pants Size 4T-5T Overnight Training Underwear (38-50 lbs) 52 Ct
Pull-Ups$28.077,935 rev
The Honest Company Comfort Dry Disposable Daytime Diapers for Sensitive Skin Hypoallergenic Wild Thang + All The Alpacas Super Club Box Size 4 (2237 lbs) 104 Count
The Honest Company$47.561,762 rev
Trending
90-day click momentum
Sposie Diaper Booster Pads Size 4-6 30 Count - Hypoallergenic Dermatologist and Pediatrician Tested Fragrance Latex Chemical and Cruelty-Free Made in USA
Select Kids$17.674.6★
Pampers Amore Size 4 (15-34 lbs) 58 Count Our Best Diaper Hypoallergenic & Fragrance Free Up to 100% Leakproof Soft as Cashmere
Pampers$26.463.5★
Amazon Brand - Mama Bear Gentle Touch Diapers Size 4 37 Count Hypoallergenic Leak Protection Wetness Indicator Stretchy Waistband Skin Safe
Mama Bear$10.614.2★
Pampers Diapers - Baby Dry - Size 4 92 Count Absorbent Disposable Infant Diaper (Packaging May Vary)
Pampers$28.274.7★
Dimples Booster Pads Baby Diaper Doubler Inserts with Adhesive - 1 Size Fits All Diapers - Boosts Absorbency - No More leaks for Overnight Travel Nighttime or Anytime 21 Count
Inspire$9.864.4★
What buyers say about overnight diapers size 4
What buyers praise and complain about, mined from review topics.What buyers love
“preventing any leaks”
“So soft”
“The fit of these diapers are also perfect”
“the quality is always consistent”
“Helps with overnight wakes”
“Good absorbency”
“Dry baby = happy baby”
“comfy & supportive”
“Good deal”
“Works as expected”
What buyers complain about
“Leaks very badly”
“Baby itching”
“Runs Small — Size Up”
“One of the worst quality diaper”
“Waste of money”
“Terrible absorbency”
“They feel paper thin”
“I can smell the pee seeping from the front of the diaper”
“did not keep him dry”
“THE PADS DO NOT HAVE AN ADHESIVE”
Top return reasons
Common questions
- Is overnight diapers size 4 profitable to sell on Amazon United States?
- The niche generates $968K/yr across 14 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -6.0%. Flapen's verdict: Worth a look (56/100).
- How competitive is the overnight diapers size 4 niche?
- 9 brands and 61 sellers compete. The top 5 products take 75% of clicks and top 5 brands hold 86% of demand.
- What do buyers complain about in overnight diapers size 4?
- Top complaints mined from reviews: Leak-Proof, Allergies, Size-Overall. The return rate is 0.7%.
- When does demand for overnight diapers size 4 peak?
- Demand is steady year-round — the busiest month runs 1.8× the quietest.
- What does it cost to enter the overnight diapers size 4 niche?
- Listings span $9.86–$51.35; the average listing price is $27.32 (sweet spot $15–$100). The average incumbent carries 24,933 reviews — the moat a new listing must climb.