can you warm these bottles in the microwave?

Warming up milk in the microwave is not just dangerous because of heat pockets. It is also the case that it changes the structure of the milk, so it is not as good or natural for your baby anymore. Don't consider microwaving any milk!

Will these bottles work with a Spectra S2 pump?

I have the 4oz bottles and the Spectra pump S1. You will need an adapter (https://smile.amazon.com/gp/product/B01A4LUZA4) to attach to the Spectra since these are narrow mouth bottles. I've found the combination works well with the adapter but be warned that the 4oz bottles are heavy so, depending on your use case, the 9oz ones could easily be too heavy to use with a pump.

Do you guys use these for breastmilk storage as well? wondering if i need to get both. if so, i'd like to get reusable storage bottles/bags.

I don't use them to store breastmilk because it would be to costly. But they can be frozen so if you are freezing the milk it will work. We v only have two bottles so I use the medela storage bottles when pumping and storing milk. I wish life factory sold glass bottles without sleeves for storage.

What's the best bottle brush to use for these bottles that have a very small opening?

I use the Norwex bottle brush. It's rubber so it is easy to keep clean and maintains its shape. Have used mine for 10 months and it's still fine.

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🍼 Elevate every feed with glass that’s as smart as your parenting style.

GRIP GUARD - Silicone sleeve offers superior drop protection and an easy grip for tiny hands mastering feeding time.
HASSLE FREE HYGIENE - Dishwasher and sterilizer safe—cleaning is effortless, so you spend more time bonding, less scrubbing.
STAGE 1 PERFECT FIT - Includes a Stage 1 vented silicone nipple designed for newborns (0-3 months) ensuring smooth feeding flow.
FREEZE TO BOIL NO FEAR - Thermal shock-resistant glass lets you safely switch from freezer to boiling water without cracking.
PREMIUM QUALITY TRUSTED ORIGINS - Crafted with care in the USA and Europe using BPA-free, high-grade materials for peace of mind.

The Lifefactory Glass Baby Bottle 4oz combines premium thermal shock-resistant borosilicate glass with a protective silicone sleeve, making it safe from freezer to boiling water transitions and drop-resistant. Designed for newborns with a Stage 1 vented nipple, it’s dishwasher and sterilizer safe for easy cleaning. BPA-free and crafted in the USA and Europe, this bottle blends safety, durability, and convenience for modern parents.

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A$45

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Australiastore

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Model number	LF110015C4
Product Dimensions	15.24 x 22.22 x 7.62 cm; 185.97 g
Item model number	LF110015C4
Target gender	Unisex
Material Type	glass
Material Composition	Glass, Silicone
Material free	BPA Free
Care instructions	Dishwasher safe (place cap parts and on top rack/no need to remove silicone sleeve unless desired)
Number of items	1
Batteries required	No
Dishwasher safe	Yes
Bottle nipple type	Vented
Bottle type	Standard Bottle
Item Weight	186 g

Lifefactory Glass Baby Bottle with Stage 1 and Protective Silicone Sleeve Blanket 4 Oz

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