Dr. Brown's Natural Flow Narrow Nipple, Level 4 (6 pack)
The right fast flow refill for Dr. Brown's narrow bottles, and only for those bottles.
The short version
- Parents feeding with Dr. Brown's narrow neck bottles
- Babies around 9 months and up who take a long time to finish a bottle on Level 3
- Your bottles are Dr. Brown's wide neck or another brand
- Your baby is comfortable on Level 3; there is no need to move up by age alone
- Your baby is close to moving off bottles to a cup
What owners like
- Flow stays consistent from nipple to nipple
- Easy to clean and fine in the dishwasher or sterilizer
- Parents who already use the vented bottles stay happy with the system
Common complaints
- Leaking from the assembled bottle, even when parents follow the fill line and assembly steps
- Flow is too fast for some babies at this level
Based on Dr. Brown's product page, nipple level guide and narrow versus wide neck guide, plus the review summary on Target's listing for this 6 pack. No editorial review of the Level 4 nipple alone was found, so themes lean on retailer feedback..
Research scores
Scored from the maker's specs and what owners report. Drew's own notes and photos will refine these.
Ownership
Drew's hands-on notes for this product are on the way. Long-term updates will be added to this timeline.
What it does
Six fast flow silicone replacement nipples for Dr. Brown's narrow neck bottles, labeled for babies 9 months and up.
- Fastest of Dr. Brown's standard flow levels, one step up from Level 3
- Breast like nipple shape that Dr. Brown's says encourages a proper latch
- Works with the bottle's internal vent, which Dr. Brown's markets as anti colic
- Maker says flow does not vary between nipples of the same level
- Six pack covers a full set of narrow bottles in one purchase
The refill to buy if your baby feeds on Dr. Brown's narrow bottles and Level 3 feeds have started to drag. Level 4 is the fastest standard flow Dr. Brown's makes, so some babies find it too quick, and it does nothing for wide neck or other brand bottles. Leaking is the most common complaint about the bottle system it fits.
How it compares
Specs
- Flow
- Level 4, fast (fastest standard level)
- Suggested age
- 9 months and up (maker)
- Count
- 6 nipples
- Material
- 100% silicone, BPA free (maker)
- Fits
- Dr. Brown's narrow bottles only, not wide neck
- Care
- Top rack dishwasher, electric and microwave sterilizers, or boiling water (maker)
Worth knowing
- Dr. Brown's lists Level 4 and the Y cut as options when a pediatrician recommends thickened milk; follow the doctor's advice on flow.
- The maker states these fit narrow bottles only and are not for wide neck bottles.
Questions
When should a baby move to Dr. Brown's Level 4 nipples?
Dr. Brown's suggests moving up from Level 3 when feeds start to take longer. The age guide is 9 months and up.
Is Level 4 the fastest Dr. Brown's nipple?
Yes, among the standard levels. The Y cut is also labeled 9 months and up but is meant for thicker liquids.
Do Dr. Brown's narrow nipples fit wide neck bottles?
No. Narrow nipples fit Dr. Brown's narrow bottles only; wide neck bottles take the wide neck nipple.
Are Dr. Brown's Level 4 nipples dishwasher safe?
Yes, top rack only, per the maker. They can also go in electric or microwave sterilizers or boiling water.
Sources
- Dr. Brown's Natural Flow Narrow Baby Bottle Silicone Nipple, Level 4 (Dr. Brown's)
- Dr. Brown's Nipple Level Guide (Dr. Brown's)
- Difference between standard/narrow and wide-neck (Dr. Brown's)
- Dr. Brown's Level 4 Narrow Baby Bottle Silicone Nipple, Fast Flow, 6pk (Target)
Researched 2026-10-02. We bought this product; our page is built from the maker's details and what owners report across reviews and forums. We never copy Amazon customer reviews.
