Momcozy Flange Insert For S12 Pro

Optimize your pumping comfort and maximize your milk output. The Momcozy S12 Pro Flange Inserts are medical-grade, authentic breast pump accessories specifically designed to fit securely inside the standard 24mm or 27mm silicone shields of the award-winning S12 Pro Wearable Breast Pump.

Because every mother’s anatomy is unique, using a standard flange that is too large can pull sensitive areola tissue into the pump tunnel, pinching the milk ducts and causing friction blisters or reduced milk flow. These precision-molded inserts solve this by shrinking the tunnel down to your exact anatomical match. By isolating just the nipple, they ensure a perfect vacuum seal that stimulates a faster letdown, prevents painful friction, and increases overall milk expression.

Key Features & Benefits

• Seamless S12 Pro Compatibility: Engineered as an authentic, factory-spec accessory. These inserts slide smoothly into the S12 Pro collection cup’s silicone shields, staying firmly locked in place without slipping, bundling, or causing air leaks that compromise suction.

• Prevents Areola Pulling: Shrunk to your specific sizing requirements, the insert blocks excessive breast tissue from being dragged down the suction channel. This eliminates pinching, protects delicate skin, and maintains a comfortable, hospital-strength pumping rhythm.

• Premium 50A Soft Liquid Silicone: Crafted from hypoallergenic, velvety-soft liquid silicone that mimics an infant’s natural soft latch. It contours comfortably to your skin, absorbing vibrations from the S12 Pro motor to reduce pumping fatigue.

• Ultra-Flexible Edge Guard: Features a micro-thin outer rim that sits completely flush against the base shield wall, ensuring a smooth transition that won’t dig into your breast or cause uncomfortable pressure points inside your nursing bra.

• 100% Safe & Toxin-Free Material: Your baby’s health is paramount. These inserts are completely free from BPA, BPS, PVC, phthalates, and latex, ensuring your expressed breast milk remains pure, uncontaminated, and nutrient-rich.

Available Sizes: Find Your Perfect Fit

Momcozy offers these inserts in a comprehensive range of sizes to ensure a tailored fit. To find your size, use a nipple ruler before pumping to measure the absolute diameter of your nipple base (excluding the surrounding areola):

Your Pre-Pump Nipple Diameter	Recommended Insert Size
9mm to 10mm	13 mm Insert
11mm to 12mm	15 mm Insert
13mm to 14mm	17 mm Insert
15mm to 16mm	19 mm Insert
17mm to 18mm	21 mm Insert

Technical Specifications

Feature	Specification
Available Insert Sizes	17mm, 19mm, 21mm
Base Shield Fitment	Slides inside standard 24mm or 27mm Momcozy flanges
Device Compatibility	Momcozy S12 Pro (Also backward-compatible with S9 Pro & M5)
Material Composition	100% Food-Grade 50A Soft Liquid Silicone
Safety Certifications	CPC (Children’s Product Certified), BPA-Free, Latex-Free
Package Configurations	Available in 2-Pack (Double set) or 4-Pack options

Installation & Care Instructions

1. How to Install: Gently press the silicone insert directly into the center tunnel of your clean S12 Pro pump flange. Ensure the outer lip of the insert sits completely flat and flush against the shield walls to maintain an airtight seal.

2. Hygiene Protocol: Wash thoroughly with warm, soapy water after every single use. These components are safe for quick steam or boiling water sterilization (100ْC / 212ْF) for 3–5 minutes.

3. Avoid Damage: To maintain optimal suction and protect the elastic properties of the silicone, avoid using stiff bottle brushes, harsh scrubs, or sharp objects inside the narrow insert tunnel.

4. When to Replace: Lactation experts recommend replacing your silicone breast pump inserts every 2 to 3 months under heavy daily use, as worn-out silicone naturally stretches over time, leading to lower suction strength and decreased milk output.