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The best way to freeze breast milk is simple: freeze it soon after pumping in small, labeled portions, using bags or containers made for breast milk, and keep it at 0°F or colder at the back of the freezer. Getting a few details right, such as headspace, flat freezing and first in, first out rotation, protects quality and saves precious milk.
Below we walk through each step using CDC guidance, then recommend six products that make freezing faster and more organized, from storage bags to freeze-flat trays and a small dedicated freezer.
Quick Answer: The Best Way to Freeze Breast Milk
- Best BagsLansinoh Storage Bags
- Best Self-Standing BagsMedela Storage Bags
- Best Freeze-Flat TraysGRETJOB Freeze-Flat Trays
- Best OrganizerLansinoh Freezer Organizer
- Best Small FreezerFeelfunn 1.1 Freezer
- Best Bigger FreezerKismile 3.0 Upright
For most parents, Lansinoh bags, a freeze-flat tray and the Lansinoh first-in, first-out organizer cover everything you need. If your kitchen freezer is crowded, a small freezer like the Feelfunn 1.1 or Kismile 3.0 keeps your stash at a steady temperature.
Best Way to Freeze Breast Milk Comparison Table
| Product | Best For | Type | Key Feature | Buy |
|---|---|---|---|---|
| Lansinoh Storage Bags | Best Bags | Pre-sterilized freezer bags | Freeze flat, expand safely | Check Price |
| Medela Storage Bags | Best Self-Standing Bags | Self-standing pre-sealed bags | Stand while filling | Check Price |
| GRETJOB Freeze-Flat Trays | Best Freeze-Flat Trays | Slim stackable freeze-flat trays | 8 trays | Check Price |
| Lansinoh Freezer Organizer | Best Organizer | First-in, first-out freezer organizer | First in, first out | Check Price |
| Feelfunn 1.1 Freezer | Best Small Freezer | Small upright freezer | Down to -7.6°F | Check Price |
| Kismile 3.0 Upright | Best Bigger Freezer | Compact upright freezer | 3.0 cu ft upright | Check Price |
The 6 Tools That Make Freezing Easier
These tools follow the steps above: portion, seal, flatten, label, rotate and store cold.
1. Lansinoh Breastmilk Storage Bags, 6 oz, 200 Count
1. Lansinoh bags are made to freeze flat and expand as milk freezes.
👍 Pros & Cons
Pros
- Freezes flat for fast thawing
- Expands as milk freezes
- Very large review base
- Value pack
Cons
- 6 oz max per bag
- Single use
- No pour spout
📄 Detailed Review
- Capacity: 6 oz per bag
- Count: 200 bags
- Size: 3.5" W x 6.25" H
- Seal: Double zipper, reinforced double side seams
- Safety: Pre-sterilized, BPA and BPS free
- Design: Freezes flat, tamper-evident tear-away top
Lansinoh’s storage bags are pre-sterilized, made without BPA or BPS and designed to expand as milk freezes. They lie flat in the freezer, which saves space and helps them thaw quickly and evenly.
Double seals, pre-sterilization and a tear-away top make them a reliable everyday choice. Fill to 2–4 oz and leave headspace.
2. Medela Breastmilk Storage Bags, 200 Count
2. Medela bags stand upright while you pour.
👍 Pros & Cons
Pros
- Stands up while filling
- Clear measurement marks
- Big write-on label
- Trusted pump brand
Cons
- 6 oz max
- No pour spout
- Single use
📄 Detailed Review
- Capacity: 6 oz / 180 mL per bag
- Count: 200 bags
- Seal: Double zipper
- Design: Self-standing, lays flat to freeze
- Labeling: Large write-on area
- Material: PET outer, LDPE inner
Medela’s storage bags come hygienically pre-sealed with a double zipper. They stand on their own while you pour, have measurement markings and a large write-on area, and lie flat to freeze.
Large write-on label for dates.
3. GRETJOB 8-Pack Clear Freeze-Flat Breastmilk Trays
3. GRETJOB trays shape bags into thin, stackable bricks.
👍 Pros & Cons
Pros
- Bags freeze in neat flat bricks
- Stackable
- Eight trays
- Inexpensive
Cons
- Not a rotation system
- Generic brand
- Tray size fits up to about 6 oz bags
📄 Detailed Review
- Count: 8 trays
- Size: 7.48 x 5.11 x 0.67 inches each
- Material: BPA-free PP
- Use: Freeze bags flat, then stack
- Weight: 1.1 lb set
- Fit: Most freezer drawers
GRETJOB’s slim trays shape each bag into a flat brick as it freezes, so bags stack neatly and thaw evenly.
Flat bags freeze and thaw faster.
4. Lansinoh Breastmilk Storage Container with Quick-Freeze Tray
4. The Lansinoh organizer rotates frozen bags automatically.
👍 Pros & Cons
Pros
- Uses oldest milk first
- Quick-freeze tray included
- Works upright or flat
- Fits most bags
Cons
- Holds about 60 oz
- Single unit
- Bulky in small freezers
📄 Detailed Review
- Capacity: Up to 60 oz of bagged milk
- Orientation: Vertical or horizontal
- System: First-in, first-out
- Tray: Quick-freeze tray to flatten bags
- Extras: 5 bonus Lansinoh bags
- Material: BPA free, freezer safe
Lansinoh’s organizer feeds new bags in one end and older bags out the other, so you always use the oldest milk first. A quick-freeze tray flattens bags for faster freezing and thawing.
Includes a quick-freeze tray.
5. Feelfunn 1.1 Cu. Ft. Mini Upright Freezer, Stainless
5. The Feelfunn 1.1 adds a dedicated, steady-temperature freezer.
👍 Pros & Cons
Pros
- Listed range down to -7.6°F
- Compact
- Adjustable shelves
- Mentions breast milk storage
Cons
- Small
- Manual defrost
- Newer model
📄 Detailed Review
- Capacity: 1.1 cu ft
- Dimensions: 17.5" W x 18.6" D x 19.2" H
- Temperature: -7.6°F to 6.8°F, 7 levels
- Shelves: Adjustable
- Door: Stainless steel, upgraded seal
- Use: Breast milk, ice cream, small stash
Feelfunn’s 1.1 cubic foot freezer lists a range of -7.6°F to 6.8°F across seven levels, comfortably below the 0°F freezer target, in a cube under 20 inches tall.
Fits in a closet or nursery.
6. Kismile 3.0 Cu. Ft. Upright Freezer
6. The Kismile 3.0 holds a large stash on shelves.
👍 Pros & Cons
Pros
- Upright shelves are easy to organize
- 7-level thermostat
- Reversible door
- Counter-height
Cons
- Manual defrost
- Only two shelves
- 3 cu ft fills quickly for events
📄 Detailed Review
- Capacity: 3.0 cu ft
- Dimensions: 20.5" W x 20.3" D x 31.7" H
- Thermostat: 7 settings, down to -7.6°F
- Listed energy use: 0.6 kWh/day
- Shelves: 2 removable
- Door: Reversible
Kismile’s 3.0 cubic foot upright freezer puts frozen food on shelves instead of in a chest, which makes it easier to find items. It has a seven-level thermostat down to -7.6°F, two removable shelves and a reversible door, and lists about 0.6 kWh per day.
Seven settings down to -7.6°F.
How We Chose the Best Way to Freeze Breast Milk
To choose the best way to freeze breast milk, we compared products sold on Amazon in the U.S. on capacity, how long each maker says it keeps milk or bottles cold, materials, ease of cleaning and fit with common pumps and bottles, and we read owner reviews for leaks, weak insulation and hard-to-clean parts. We checked storage times against CDC breast milk storage guidance. We are not medical professionals; follow your pediatrician or lactation consultant for advice about your baby.
We checked storage times against the CDC’s guidance on proper storage and preparation of breast milk (up to 4 hours at room temperature, up to 4 days in the refrigerator, about 6 months in the freezer as best, up to 12 months acceptable) and food-safety temperatures against the FDA’s food storage advice. Our full process is explained on our How We Test page. We do not list prices or star ratings because they change daily.
Step-by-Step: The Best Way to Freeze Breast Milk
1. Freeze soon
If you will not use freshly expressed milk within 4 days, the CDC advises freezing it right away to protect quality. Cool it in the fridge first if you are combining sessions.
2. Portion small
Store 2 to 4 oz, or the amount offered at one feeding, so you do not thaw more than you need.
3. Use the right container
Use bags or clean, food-grade glass or plastic containers with tight lids made for breast milk, never general plastic bags or bottle liners.
4. Leave headspace
Leave about an inch at the top; milk expands as it freezes. Squeeze air out of bags before sealing.
5. Label and freeze flat
Write the date (and your child’s name for childcare). Lay bags flat on a tray until frozen, then stand them upright.
6. Store at the back
Keep milk away from the freezer door and at 0°F or colder. About 6 months is best; up to 12 months is acceptable.
Tips for Safe Breast Milk and Bottle Storage
- Date every bag. Before freezing.
- Freeze flat first. Then file upright.
- Use oldest first. First in, first out.
- Check freezer temp. 0°F or colder.
Below are common questions readers ask about choosing the best way to freeze breast milk.
Frequently Asked Questions
What is the best way to freeze breast milk?
Freeze small, labeled portions in breast milk bags with an inch of headspace, flat on a tray, at the back of a freezer at 0°F or colder.
How long can I freeze breast milk?
About 6 months is best and up to 12 months is acceptable, per the CDC.
Can I add fresh milk to frozen milk?
Cool fresh milk first; ask your pediatrician about combining batches.
Why does frozen milk smell different?
Some parents notice a soapy smell after freezing; ask a lactation consultant if your baby refuses it.
Final Verdict
The best way to freeze breast milk is to freeze small, dated portions in breast milk bags, flat and away from the door, at 0°F or colder. Lansinoh bags, freeze-flat trays and a first-in, first-out organizer make the best way to freeze breast milk easy to follow.
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