Grosmimi Stainless Steel Straw Cup with Flip Top - 6oz (12 Months+)
Grosmimi Stainless Steel Straw Cup with Flip Top - 6oz (12 Months+)
Choose your baby's stage· One cup that grows with your baby
- 1 Bottle 0–6m
- 2 Straw Cup 6–12m+
- 3 Tumbler 18m+
Material: Stainless Steel
Size & Type: 6oz & Flip Top
Free shipping on orders $75+ · Ships within 1 business day
Bisphenol-A Free
Double-Wall Insulation
360° Handle for a Secure Grip
Leak-Preventing (+) Cut Design
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Description
Description
Specs
Specs
Materials
Materials
Care Guide
Care Guide
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Korea’s No.1 Toddler Straw Cup
946,000+
Cups sold annually
30+ Countries
Loved by Moms Worldwide
Patented tech
related to straw nipples
CPSIA Compliant
Tested by a CPSC - verified Laboratories
Leak-Proof Design
Squeeze it. Pinch it. It won't leak.
The + cut straw tip seals under pressure. Toss it in the diaper bag — no spills, no mess.
One Touch Cap
Open with one hand. While holding baby with the other.
Thumb-press flip cap opens instantly. Steel-free, anti-dust design keeps the straw clean between sips.
Sealed in Motion
Shake it. Swing it. Still sealed.
Toddlers don't just drink — they shake, throw, and swing. The + cut straw stays sealed through all of it.
One of the Top 5 Best-Selling Toddler Straw Cup Brands on Amazon US
#1 Best-Selling PPSU Straw Cup
Over 8,000 reviews ★ 4.5 out of 5.0 rating
- Forbes
Stainless Steel
Stainless Steel is a high-performance material known for its exceptional durability and resistance to rust and corrosion. Commonly used in medical, food, and industrial applications, it is a safe and hygienic choice for various products. Stainless Steel is perfect for baby bottles, cups, and kitchenware as it does not absorb odor or color and maintains its quality even after repeated sterilization. Unlike plastic, it is unbreakable and highly resistant to temperature changes, ensuring long-lasting use. There is no better choice. Now, stainless steel products come in various finishes, from classic silver to modern matte black, offering both style and functionality. Try Grosmimi Stainless Steel.
Innovative Technology
● Made from liquefied silicone.
● Which is material for baby nipples.
● The textures are about the same.
● Babies can get used to a straw without any resistance.
● Cross cut straws will not leak or backflow.
Effortless Cleaning & Assembly
● All parts are simply removable.
● Easy to clean.
● Dishwasher safe.
● Easy to reassemble.
Customize your own bottle
● We got variety of kits.(sold separately)
● No matter which feeding style you have.
● Any combination is possible.
● You can customize your own bottle with a wide selection.
● It is also compatible with other selected brands.
The Material
Why Stainless Steel.
SUS 304 and SUS 316 stainless steel are the same grades used in medical equipment and food processing. They resist corrosion, retain no flavors, and keep drinks at the right temperature for hours — without any plastic touching the liquid.
-
SUS304/316
Medical and food-grade stainless steel
-
BPAFree
No plastic contact with the liquid
-
🇰🇷
Made in Korea by Grosmimi
Selection Guide
Start small, then size up.
The 200ml flip top is lighter and easier for toddlers to carry. The 300ml is ideal for longer outings or when your child drinks more volume.
When babies start teething, they begin to chew on the straw teat. For babies over 12 months who tend to bite, a firmer straw teat is available separately.
Grows With Your Baby
One system, every stage.
Grosmimi's full product line covers every stage — from bottle to straw cup to tumbler. Each product is compatible with the same accessories, so you invest in a system, not throwaway cups.
What's Included
Everything in the box
-
Cup Body
PPSU or Stainless Steel
-
Flip Top Cap
One-touch open
-
Silicone Straw Teat
Included
-
Silicone Straw Tube
Replaceable
Includes Straw teat. Additional straw teats and accessories are available separately.
Care & Sterilization
How to sterilize each part
| Method | Body (SUS 304) | Cap (PP) | Straw (Silicone) | Accessories |
|---|---|---|---|---|
| Hot Water | Yes | Yes | Yes | Yes |
| UV Sterilizer | Yes | Yes | No | Yes |
| Dishwasher | Yes | Yes | No | Yes |
| Steam | Yes | Yes | Yes | Yes |
| Microwave | No | No | No | No |
Tips: Do NOT microwave stainless steel. Replace silicone parts every 2-3 months. Always disassemble all parts before cleaning.
The Brand
From Grosmimi. Made in Korea.
Grosmimi crafts PPSU feeding products for babies — from bottles to straw cups to tumblers. Made in Korea, trusted by parents worldwide.
Korean Brand Consumer Evaluation 2023
Infant Products Winner — Feeding Bottle & Straw Cup category.
Real reviews
Real parents, real reviews.
Creators using this with their own kids.
Replacement
Weighted Spout kit
Shop Now- Age: +6m
- Strength: Soft
- Durability: Weak
Weighted Straw kit
Shop Now- Age: +6m
- Strength: Soft
- Durability: Weak
Straw Kit Stage 1
Shop Now- Age: +6m
- Strength: Soft
- Durability: Weak
Straw Kit Stage 2
Shop Now- Age: +12m
- Strength: Hard
- Durability: Strong
Stage2 Nipple only
Shop Now- Age: +12m
- Strength: Hard
- Durability: Strong
We're answerable!
When should I replace the straw, and how?
When should I replace the straw, and how?
Grosmimi grows with your child! Start with a baby bottle and easily switch to a straw cup by changing the parts—no need to buy a whole new cup.
EASY TEAT: Available in 4 stages:
(Stage 1: 1–3 months, Stage 2: 3–5 months, Stage 3: 5–8 months, Stage 4: 8 months+)
SPOUT: Great for babies (4M+) starting baby food early.
WEIGHTED KIT: Helps babies (6M+) drink from any angle while holding the cup.
STAGE 1 STRAW: A super soft straw (6M+), made from the same material as baby nipples, helps babies transition to straw drinking comfortably.
STAGE 2 STRAW: A firmer straw (12M+) for older babies. The flow is the same as Stage 1, but the silicone is stronger. Switch to Stage 2 when babies start chewing more.
- Silicone straws & mouthpieces: Every 2-3 months
- PPSU bottle: Every 6-12 months
- Replacement timing may vary based on usage.
What’s the difference between stage 1 and stage 2 straws?
What’s the difference between stage 1 and stage 2 straws?
- First-stage: Softer, for beginners or non-chewers.
- Second-stage: Firmer, for children over 12 months who chew frequently.
- Grosmimi cups come with first-stage straws by default.
How do I sterilize Grosmimi straw cups at home?
How do I sterilize Grosmimi straw cups at home?
It can also be hygienically maintained through various sterilization methods, including boiling, steam sterilization, dishwasher, UV sterilization, and microwave sterilization.
What is the function of an air valve?
What is the function of an air valve?
It helps regulate pressure balance when there is a difference between internal and external pressure, requiring a pinch to function properly. This feature is especially useful when there is a temperature difference with external environments, such as warm water, and plays a crucial role in preventing leaks.
How do I choose the right cup size?
How do I choose the right cup size?
If your baby is new to straw cups, the shorter 200ml size is often easier for them to handle. For basic use like water or small quantities of liquids, 200ml is sufficient. If your child drinks more or if you plan to fill it with milk or other beverages, a 300ml cup is recommended.
What's your return policy?
What's your return policy?
Unopened items can be returned within 30 days. Customer-remorse returns carry a 15% restocking fee and a $7.99 return label; defective or incorrect items are always free to return. Some items (Alpremio, Comme Moi, food products, gift cards) can't be returned — see our Refund Policy for details.
What age is the Grosmimi straw cup for?
What age is the Grosmimi straw cup for?
Grosmimi straw cups are designed for babies 6 months and older. The weighted straw lets babies drink at any angle, making it ideal for the transition from bottle to cup.
Where is Grosmimi made?
Where is Grosmimi made?
Grosmimi products are designed and manufactured in South Korea. The brand is one of the most trusted baby bottle brands in Korea, widely used in Korean postpartum care centers.
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- DWDaniele W.Verified BuyerReviewingGrosmimi Stainless Steel Straw Cup with Flip Top - 6oz (12 Months+)I recommend this productRated 5 out of 5 stars2 months agoLove these straw cups!
I used these cups with both of my older girls and now oh my 1 year old. I love them!
- SDSALOME D.Verified BuyerReviewingGrosmimi Stainless Steel Straw Cup with Flip Top - 6oz (12 Months+)I recommend this productRated 5 out of 5 stars3 months agoTwin mom essential 🤍
I’ve been using these Gromimi thermal bottles for my twins and honestly love them 🤍
They keep drinks at the perfect temperature for hours, which makes everyday outings so much easier. Plus, the design is so cute and minimal.
- JYJocelyn Y.Verified BuyerReviewingGrosmimi Stainless Steel Straw Cup with Flip Top - 6oz (12 Months+)I recommend this productRated 5 out of 5 stars3 months agoGreat for babies!
I really like this bottle for my 7 month old who is learning to use a straw. Baby is really into it, and the bottle is sturdy!
- SSSarah S.Verified BuyerReviewingGrosmimi Stainless Steel Straw Cup with Flip Top - 6oz (12 Months+)I recommend this productBaby's Age 6 Months - 2 YearsRated 4 out of 5 stars7 months agogreat cup, loud when dropped
great product, very $$$$ and loud when dropped
- MLMeghan L.Verified BuyerReviewingGrosmimi Stainless Steel Straw Cup with Flip Top - 6oz (12 Months+)I recommend this productRated 5 out of 5 stars1 year ago5 Stars
The cutest cup! Especially perfect for hot summer days! Will purchase again
