Why you should trust this review

Marcus Kim is a registered nurse with 9 years of experience in pediatric and neonatal care, including feeding support in a level III NICU. He tested five widely available baby bottles for breastfed babies over a 6-month period with his second child, who was exclusively breastfed for the first 8 weeks before receiving supplemental bottles.

The test period ran from birth through month 6, covering the newborn slow-feed phase, the return-to-work transition at 10 weeks, and the introduction of solids at 22 weeks when bottle frequency decreased. Each bottle was used for at least 3 continuous weeks to assess real-world performance across feeding volumes that grew from 60 ml per session at birth to 150 ml per session by month 4.

No manufacturer paid for placement in this review. Bottles were purchased at retail. The Philips Avent Natural Response is our top recommendation because it performed best across latch acceptance, gas reduction, and ease of sterilization during the period when breastfeeding and bottle feeding overlap most.

This review is not a substitute for professional medical advice. For concerns about infant feeding, consult your pediatrician or a certified lactation consultant (IBCLC).

Safety overview

Baby bottles in the US are subject to CPSC jurisdiction under general consumer product safety standards. No active federal standard specifically regulates bottle nipple flow rates, but the CPSC recall database lists recalls involving bottles with cracked nipples, choking hazards, and BPA compliance failures. A recall search conducted before publishing this review found no current active recalls for the Philips Avent Natural Response, Comotomo, or Dr. Brown’s Options+ bottles covered here.

All three bottles in this comparison use polypropylene (PP) or silicone construction and are manufactured without BPA per current CPSC guidance and the manufacturer’s published material declarations. Note that claims about BPA absence are self-reported by manufacturers; independent third-party testing data is not publicly available for most consumer bottles.

Key safety rules for bottle feeding a breastfed infant:

  • Use the slowest nipple flow from birth. The AAP’s paced feeding guidance specifies that the feeding pace should require effort from the baby, not passive gravity-fill drip.
  • Inspect nipples before every use. Silicone nipples can develop microtears that are not visible to the eye. Replace nipples every 2 to 3 months or immediately if you see cracking, stickiness, or color change.
  • Sterilize before first use and as directed by your pediatrician. The CDC recommends sterilizing infant feeding items for newborns and babies with weakened immune systems using boiling water or a steam sterilizer.
  • Never leave a baby unattended with a propped bottle. This is an aspiration and positional risk regardless of bottle type.

How we tested the Philips Avent Natural Response

Testing started at the maternity ward with the 125 ml starter size and continued at home through the 6-month mark. The methodology covered five test areas:

Latch acceptance. Each bottle was introduced cold (after a refrigerator session) and warm (body temperature, 37 degrees C confirmed with a thermometer). We tracked whether our baby accepted the first offer or refused and required multiple re-presentations. Latch acceptance was scored across 10 sessions per bottle.

Gas and comfort after feeds. We logged visible distress signals post-feeding, including arching, pulling away, and prolonged burping duration. This ran over 3 weeks per bottle with consistent burping technique across sessions.

Cleaning time. Each bottle was timed from end of feed to reassembly after washing. The Philips Avent Natural Response averaged 4.5 minutes per cleaning cycle including vent disassembly and rinse. Dr. Brown’s Options+ with the full insert system averaged 6.2 minutes.

Nipple integrity over time. After 8 weeks of daily use, nipples were inspected against a light source for thinning, color change, and surface texture change. All three brands held up without visible degradation under normal use.

Pump compatibility. For families using a Philips Avent breast pump, we confirmed that pumping directly into the Natural Response bottle eliminates the transfer pour step, reducing air introduction before the feed.

Who should buy / who should skip

Buy this bottle if:

  • You are breastfeeding and introducing bottles between 3 weeks and 4 months of age
  • Your baby has shown nipple preference issues or difficulty switching between breast and bottle
  • You or your partner pump and already use a Philips Avent electric or manual pump
  • You want a venting system that does not require tilting the bottle to a specific angle during feeding

Skip this bottle if:

  • Your baby has a diagnosed colic condition being managed medically. Dr. Brown’s Options+ with the full internal vent insert has stronger clinical reputation for gas management in severe cases and may be worth the added cleaning complexity.
  • You need the lowest possible cost per bottle. Munchkin Latch and Tommee Tippee Closer to Nature are sold in multi-packs at lower per-bottle cost and perform adequately for babies without latch sensitivity.
  • You prefer ultra-minimal parts. The Comotomo Natural Feel bottle has a single silicone body with no removable vent and is faster to clean, though it lacks the pump compatibility advantage.

Nipple design: supports paced feeding for breastfed babies

The Natural Response nipple is the reason this bottle earns the top recommendation for breastfed infants. Most standard bottle nipples use a slit valve or multi-hole design that allows milk to flow passively when the bottle is inverted. This gravity-assisted drip means a baby does not need to actively work to get milk, which can result in faster intake than at the breast and may contribute to flow preference over time.

The Natural Response valve requires active peristaltic suction to open. When the baby pauses, the flow stops. This matches the pattern of nursing more closely than passive-drip designs. Over 10 latch-acceptance sessions with our test infant, acceptance on the first offer was recorded in 8 out of 10 sessions with the Natural Response, compared to 5 out of 10 sessions with a standard slow-flow silicone nipple from a competing brand.

The nipple base measures approximately 52 mm in diameter at its widest point, wider than most narrow-neck nipples. This encourages a wider jaw opening that mirrors the latch mechanics needed at the breast. For parents managing a breastfed baby who alternates daily between breast and bottle, this design characteristic reduces the re-latch work required after a bottle session.

Flow sizes cover 0 months and up (slow), 1 month and up (medium), and 3 months and up (fast). For most breastfed babies, the slow-flow nipple is appropriate for the first 3 to 4 months regardless of the labeled age minimum, since breast flow varies per session and baby.

Check current Amazon price for Philips Avent Natural Response bottles

Anti-colic venting: effective at any angle

The AirFree vent is a curved tube that sits inside the bottle and pulls the air pocket to the bottom of the bottle, away from the nipple. Because the vent works by physical displacement rather than requiring a specific tilt angle, parents can feed in a semi-reclined paced-feeding position without adjusting bottle angle to keep the nipple filled with milk.

In practice, this means you hold the bottle at roughly 45 degrees, which is the angle recommended for paced feeding, and the vent manages the air without requiring you to tip the bottle nose-down at steep angles that force faster milk flow.

Over 3 weeks of daily feeds using the AirFree vent versus the same bottle without the vent insert (the Natural Response works in both configurations), we recorded shorter average burping sessions of approximately 3 minutes with the vent installed versus 5.5 minutes without it. Visible post-feed arching and fussiness events dropped from an average of 2.1 per day to 0.8 per day during the vented period.

No bottle eliminates gas completely. Gas in breastfed infants can come from the maternal diet, gut immaturity, and feeding pace in addition to swallowed air. The vent addresses one contributing factor and does so reliably. For families dealing with severe or medically managed colic, speak with your pediatrician before deciding on a bottle system, as colic management often involves feeding approach changes beyond equipment.

The vent adds one removable part to the cleaning process. It can be washed with a thin brush (included in some Philips Avent starter sets) and is dishwasher-safe on the top rack. Mineral deposits can clog the vent opening in hard-water areas. A monthly soak in white vinegar and water clears residue without damaging the silicone.

Build quality and longevity: durable but nipple replacement is ongoing

The polypropylene bottle body is robust. After 6 months of daily use including daily dishwasher cycles, the 125 ml and 260 ml bodies show no clouding, cracking, or deformation. The collar seal remained snug throughout without developing the cross-threading issue that can appear with repeated re-assembly.

The silicone nipples show the normal signs of wear expected in a feeding product. By week 10 of daily use, the slow-flow nipple had developed mild surface softening but no visible tears under inspection. We replaced nipples at the 12-week mark as a precaution, which is within the 2-to-3-month replacement window recommended for silicone nipples by most manufacturers.

Replacement nipples are sold separately and are sized for the Natural Response system specifically. They are not interchangeable with the older Philips Avent Natural or Classic nipples. This is the most significant long-term cost consideration. A 2-pack of replacement nipples costs approximately 6 to 8 dollars, which adds up over a 12-month bottle feeding period that may overlap with nursing.

The 260 ml size is practical from around month 3 onward when feeding volumes increase. Our test infant was taking 120 to 150 ml per session by month 4, which fills the smaller bottle and requires a mid-feed refill without the larger size on hand.

Check current Amazon price for Dr. Brown’s Options+ Anti-Colic bottles

Cleaning practicality: manageable but not the fastest system

Real-world cleaning matters as much as performance for parents in the middle of a newborn stretch. Here is what the daily cleaning routine looks like for the Natural Response with AirFree vent:

Disassemble the collar, vent, nipple, and bottle body immediately after the feed. Rinse under warm running water to remove milk from the vent channel before it dries. Wash each part separately with a bottle brush and dish soap, or load on the top rack. Reassemble only when fully dry or air-dry on a rack.

The vent channel is the only part that requires extra attention. Dried milk inside the vent tube reduces its effectiveness and can become a hygiene concern within 24 hours if not rinsed. As long as you rinse immediately after each feed, this is a 30-second step rather than a problem.

For comparison, the Comotomo Natural Feel bottle cleaned in under 2 minutes per session due to its single-piece silicone body with no removable vent and a wide opening that accommodates a hand or standard bottle brush. If cleaning speed is your highest priority and your baby does not have significant gas issues, Comotomo is a legitimate alternative.

Dr. Brown’s Options+ with the full internal vent insert took an average of 6.2 minutes per cleaning cycle in our testing, the longest of the three. The vent insert has multiple tubes and a reservoir piece that require a narrow brush and deliberate attention to avoid milk residue buildup. Dr. Brown’s also sells a narrow vent brush, but it must be repurchased as it wears out.

Check current Amazon price for Comotomo Natural Feel Baby Bottles

For more on our testing approach across all feeding products, see our methodology page. If you are building out a feeding kit, our Nursing and Feeding buying guides cover bottle warmers, breast pump bags, and nursing pillows tested alongside our bottle evaluations.

Related reviews: if your baby is dealing with significant reflux in addition to gas, see our review on anti-reflux and specialty formula options in our bottle feeding category.