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 feeding time with style, safety, and ease—because your baby deserves the best!

GRIP GUARD - Durable silicone sleeve prevents breakage and offers secure hold for tiny hands.
HYGIENE MADE EASY - Dishwasher and sterilizer safe—no sleeve removal needed for quick cleanups.
STAGE 2 NIPPLE PERFECTED - Designed for 3-6 months, ensuring smooth transition and comfortable feeding.
TOXIN FREE PEACE OF MIND - BPA, phthalate, and PVC free for the health-conscious modern parent.
FREEZE TO BOIL NO CRACKS - Borosilicate glass endures extreme temps safely for worry-free feeding.

The Lifefactory 9-Ounce Glass Baby Bottle features premium thermal shock-resistant borosilicate glass that safely transitions from freezer to boiling water. Wrapped in a durable silicone sleeve for breakage protection and easy grip, it includes a Stage 2 nipple ideal for 3-6 month olds. Fully dishwasher and sterilization safe without removing the sleeve, this BPA- and phthalate-free bottle combines safety, hygiene, and convenience for discerning parents.

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Product Dimensions	1 x 2 x 2 inches
Item model number	LF110008C4
Is Discontinued By Manufacturer	No
Target gender	Unisex
Material Type	Glass
Material Composition	Glass, Silicone
Material free	Phthalates Free
Care instructions	Dishwasher safe (place cap parts and nipple on top rack/no need to remove silicone sleeve unless desired), Nipples should be washed on the top rack of the dishwasher only.
Additional product features	Alcohol-Free
Number Of Items	1
Batteries required	No
Dishwasher safe	Yes
Bottle nipple type	Vented
Bottle type	Standard Bottle
Is portable	No
Item Weight	9.6 ounces

Lifefactory 9-Ounce Glass Baby Bottle with Protective Silicone Sleeve and Stage 2 Nipple Cobalt Blue (LF110008C4)

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