Compare Baby Bottles
Pura Kiki Stainless Steel Baby Bottle (5 oz) scores higher on safety - here's why.
R3 scored the Pura Kiki Stainless Steel Baby Bottle (5 oz) 10.0/10 and the Lifefactory Glass Baby Bottle (4 oz) 9.1/10 on the same baby bottles scoring system, weighing safety, efficacy, and usability. The Pura Kiki Stainless Steel Baby Bottle (5 oz) comes out ahead, led by its safety score (10.0/10 vs 9.4/10).
The most important dimensions, side by side.
See which one actually scores higher — and why
Free account unlocks full safety scores, spec-by-spec breakdown, and the R3 verdict on Pura Kiki Stainless Steel Baby Bottle (5 oz) vs Lifefactory Glass Baby Bottle (4 oz).
Unlock the full Pura Kiki Stainless Steel Baby Bottle (5 oz) vs Lifefactory Glass Baby Bottle (4 oz) breakdown
Free account unlocks all safety scores, complete spec comparison, scoring rationale, and the R3 verdict on which one to buy.
Everything you need to make the call - who each one is for, and who should skip it.
Go for it if you...
You want an unbreakable, fully inert bottle for daycare and travel
You are switching a breastfed baby between breast and bottle
You want independent lab proof, not just the brand's word, on contaminants
Your baby is gassy and you want anti-colic venting
You want the most inert material touching your baby's milk and mostly feed at home
You are switching a breastfed baby between breast and bottle
You want independent lab proof, not just the brand's word, on contaminants
The main thing to know
No major safety gap stands out; the main trade-offs are about feeding features and daily convenience.
Glass is the safest material inside but it can break and is heavier, so think about whether it fits daycare and on-the-go use.
Skip this if you...
You specifically want a glass bottle for the most inert material
You want the lowest-priced bottle and are not focused on materials
You need a lightweight, drop-proof bottle for daycare or stroller life
Your baby struggles with gas and needs a strong anti-colic vent
Neither of these quite what you're looking for?
I've reviewed all Baby Bottles options at every price pointEvery Baby Bottles in our database is scored using R3's deterministic scoring system - the same inputs always produce the same score. For this comparison, we evaluated Pura and Lifefactory across 3 independent criteria: Safety (91%), Efficacy (8%), Usability (2%). No sponsored rankings. No paid placements.
Straight answers - no sponsored content, no filler.
I'd start with Pura Pura Kiki Stainless Steel Baby Bottle (5 oz) - it scored 10.0/10 overall in our scoring system. Safety is our top-weighted scoring pillar, followed by efficacy, and usability. Check which pillar matters most to your family and compare those specific scores.
R3 uses a deterministic scoring system - the same inputs always produce the same score. We evaluate each Baby Bottles across Safety, Efficacy, Usability using independently verified data. No sponsored rankings. No paid placements. Every score is fully reproducible.
Not necessarily. The overall score reflects how we weight those three pillars, but your priorities may differ. If you care most about safety, compare the safety scores directly. If budget drives your decision, the prices tell a clearer story. The "right" pick is the one that matches what matters most to your family.
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