This article contains affiliate links. As an Amazon Associate we earn from qualifying purchases at no extra cost to you. Prices and availability are accurate as of May 5, 2026 and subject to change.
Quick verdict: The Pura Kiki is the bottle to buy if you want a plastic-free feeder that will follow your kid from newborn through sippy-cup years without forcing you to rebuy hardware every six months.
Pura's pitch is unusual in a category dominated by polypropylene and silicone: a stainless steel bottle body that swaps nipples, sippy spouts, and straws as the child ages. We've handled it alongside the standard plastic and silicone options parents actually choose between, and it occupies a specific niche, not the cheapest, not the most convenient, but the most durable and the most defensible for parents who've decided plastic is off the table.
Pura Kiki Stainless Steel Baby Bottle
A plastic-free bottle system that converts from newborn feeder to toddler sippy without buying new hardware.
Check Price on AmazonWho this is for
Parents who've made a deliberate decision to keep plastic out of their kid's mouth, whether the reason is BPA, BPS, microplastic shedding from heated bottles, or just a general preference for materials that won't end up in a landfill in two years. The Kiki is also a sensible pick for families who want one bottle system that lasts. The 5oz body grows into the 9oz and 11oz sizes, and the same bottle takes a slow-flow newborn nipple, a faster nipple for older infants, a sippy spout for one-year-olds, and a straw for toddlers. You buy the body once.
It's a poor fit for parents who prioritize convenience above all, who exclusively pump and need a bottle that interfaces directly with their pump flanges, or who hand the bottle to a daycare that insists on clear plastic so they can see the milk level.
What we like
- Genuinely plastic-free at the contact points. The bottle body is 304 stainless. The nipple, sleeve, and sealing disc are medical-grade silicone. There is no plastic touching milk, even at the threads, a detail most "plastic-free" bottles fudge.
- The conversion system actually works. Swapping the silicone nipple for a sippy spout or straw takes about ten seconds. We've seen this kind of "grows with baby" promise made by other brands and quietly walked back; Pura's parts genuinely fit the same bottle body across stages.
- Dishwasher safe, top to bottom. Stainless doesn't cloud, doesn't stain from carrots or formula, and doesn't develop the faint sour smell plastic bottles get after a few months of heavy use. Run it through with the rest of the dishes.
- Drop survivability. Stainless dents on a tile floor; it doesn't crack. We've watched plenty of glass bottles end a feeding session early. The Kiki shrugs off the kind of toddler launches that retire other bottles.
- The silicone sleeve serves a purpose. It's not just a color option, it dampens the metallic clank when the bottle hits a high chair tray and gives small hands something grippy to hold.
What we don't like
- You can't see how much milk is left. This sounds minor until you're trying to figure out at 3 a.m. whether the baby took two ounces or four. There are faint embossed measurement marks on the inside of the bottle, but they're hard to read with milk in them and useless in low light. Caregivers used to clear bottles will find this genuinely annoying for the first week.
- Heating takes longer and requires more attention. Stainless conducts heat aggressively. A warm-water bath that takes three minutes with a plastic bottle takes five or six here, and the outside of the bottle gets hot enough that you need to test it before handing it over. Microwaving is out, obviously.
- The price is real. A single Kiki bottle runs roughly twice what a comparable plastic bottle costs, and you typically need three or four in rotation. The math works out over the long term because you don't replace the body, but the upfront cost stings.
- Nipple flow options are narrower than the big brands. Dr. Brown's and Avent offer half a dozen flow rates and specialty nipples for preemies and reflux babies. Pura covers the standard slow/medium/fast progression and not much else. If your baby is picky about nipple shape, this may be a dealbreaker.
How it compares
The closest direct competitor is the Klean Kanteen Babywhich uses the same stainless-plus-silicone formula and a similar grows-with-baby system. Klean Kanteen's bottle is slightly heavier and the nipple sits on a wider collar that some babies struggle with; Pura's narrower neck and softer silicone nipple were easier for the newborns we've watched feed from both. If you already own Klean Kanteen water bottles and want accessory compatibility, theirs makes sense. Otherwise the Kiki is the better-feeding bottle.
ThinkBaby is the value plastic alternative, BPA-free, BPS-free, phthalate-free polypropylene at about half the price. If your concern is specifically the chemicals that have been phased out of baby plastics rather than plastic as a category, ThinkBaby is a reasonable pick and it solves the see-through-milk problem. It will not last as long, and it is still plastic.
Comotomo is the silicone-bodied competitor and the bottle most often recommended for breastfed babies who reject standard nipples. Its squishy body mimics breast tissue and the wide nipple base helps with latch transitions. We'd choose Comotomo over Pura specifically for breast-to-bottle transitions; we'd choose Pura over Comotomo for everything after that point, because Comotomo doesn't convert to a sippy or straw and you'll be buying new hardware at the one-year mark anyway.
Recommendation: buy the Pura Kiki if you want one bottle system for the entire feeding arc and you've ruled out plastic. Buy Comotomo if you're fighting a bottle-rejection battle. Buy ThinkBaby if budget is the primary constraint.
The verdict
The Pura Kiki earns its price for the small subset of parents it's designed for: people who want stainless steel against their baby's milk, who plan to keep using the bottle past the one-year transition, and who can live with not seeing the fluid level at a glance. It is not the most convenient bottle on the market and it is not the cheapest. It is the most durable, the most truthfully plastic-free, and the only one we've used that genuinely follows a kid from the newborn nipple to the toddler straw cup. If you're working through the broader list of baby must-haves and trying to make decisions you won't redo in eight months, this is the bottle to buy.
Frequently asked questions
Is stainless steel safe for baby formula and breastmilk?
Yes. Food-grade 304 stainless is inert and doesn't leach at the temperatures involved in feeding. It's the same material used in commercial kitchen equipment and high-end water bottles. There's no liner inside the Kiki, the milk sits directly against the steel.
Will the bottle make milk taste metallic?
We haven't found that to be the case in normal use, and babies who took plastic and silicone bottles took the Kiki without noticeable protest. If milk sits in any bottle for hours it will pick up flavors from the container; that's true of stainless, plastic, and glass alike. Feed promptly and it isn't an issue.
Can you sterilize it the same way as a plastic bottle?
Yes, boiling, steam sterilizers, and dishwasher sanitize cycles all work. The one method to skip is the microwave, both for the bottle body (it's metal) and as a general practice. If you're already sorting through breastfeeding essentials like sterilizers and storage, the Kiki slots into the same sterilizing routine you'd use for any silicone-and-glass setup.
How many bottles do I actually need?
For exclusive bottle feeding, plan on four to six in rotation; for combination feeding alongside nursing, two or three is usually enough. The conversion to sippy and straw means you don't buy new bottles at six months or twelve months, you buy a $5 silicone part. If you're outfitting a diaper bag for outingsone or two Kikis with sealing discs travel well because they don't leak when capped properly.
Does it leak?
Not when assembled correctly. The sealing disc is the part most parents forget, it's a flat silicone insert that goes between the nipple and the collar, and the bottle relies on it to be watertight. Skip the disc and you'll get drips. Use it and the Kiki survives a tipped diaper bag without staining the contents.
