Thoroughly Reviewed
This product was evaluated based on verified specifications, safety standards, and independent research. Last tested: June 2026.
Dr. Brown's
Dr. Brown's Natural Flow Original Bottle Review 2026: Best for Gas & Colic
Dr. Brown's Natural Flow bottle uses an internal vent system to virtually eliminate air ingestion. Our review covers whether it lives up to the hype.
Our Score
out of 10
4.6/5 rating
Where to Buy
Pros
- ✓Internal vent system proven to reduce colic and gas
- ✓Preserves vitamins C, A, and E in breast milk
- ✓Level 1 slow-flow nipple ideal for newborns
- ✓Widely recommended by pediatricians
Cons
- ✗More parts than other bottles (vent tube, reservoir)
- ✗Slightly more to clean after each use
- ✗Vent must be assembled correctly or leaking occurs
Our Bottom Line
For colicky or gassy babies, Dr. Brown's Natural Flow is often the bottle that finally provides relief. The extra parts are worth it for families who need it.
Affiliate disclosure: PregnancySprout may earn a commission from purchases made through links on this page. This does not affect our recommendation — we only suggest products we genuinely believe offer good value. Learn more about how we test products.
Specifications
- Material
- BPA-free polypropylene
- Neck Style
- Standard or Wide (both available)
- Vent System
- Internal vent tube + reservoir
- Parts
- 6 (standard)
- Nipple Levels
- 0, 1, 2, 3, 4, Y-cut
- Dishwasher Safe
- Yes
- Microwave Sterilizable
- Yes
| Specification | Value |
|---|---|
| Material | BPA-free polypropylene |
| Neck Style | Standard or Wide (both available) |
| Vent System | Internal vent tube + reservoir |
| Parts | 6 (standard) |
| Nipple Levels | 0, 1, 2, 3, 4, Y-cut |
| Dishwasher Safe | Yes |
| Microwave Sterilizable | Yes |
Frequently Asked Questions
How does the internal vent system work?
A tube runs from the nipple to the base of the bottle. As baby feeds, air travels through this tube to the bottom, venting completely away from the milk. Baby only ingests milk — not air bubbles — which significantly reduces gas, spit-up, and colic symptoms.
Are all the parts necessary?
For newborns, yes. Once your baby is older (typically 4+ months) and their digestive system has matured, some parents remove the vent for simpler cleaning. Dr. Brown's sells a "transition" kit for this stage.
Why does the bottle leak when assembled wrong?
The vent tube must seat correctly in the reservoir and the ring must be tightened properly. The most common cause of leaking is an incompletely tightened collar ring. Watch Dr. Brown's assembly tutorial for first use.