Not a substitute for professional medical advice. Consult your pediatrician with questions about feeding transitions for your child.
Why you should trust this review
Emma Thompson is a registered pediatric nurse (RN, BSN) with 9 years of clinical experience in a pediatric ward and an outpatient feeding clinic. She has evaluated sippy cup materials and feeding transitions with hundreds of families across age ranges from 6 months through preschool. For this review, Emma researched cups daily in her own home with two children, ages 14 months and 28 months, over a 6-month period from December 2025 through May 2026.
The Pura Kiki review unit was purchased at retail price. No brand provided compensation for this review, and affiliate compensation does not influence our safety recommendations.
All material claims about plastics and metals in this review are sourced to the CPSC, AAP, or CDC, linked in the sources section at the end of the page. Where we cite manufacturer claims about materials, we note them as manufacturer-stated rather than independently verified.
Safety overview
Sippy cups fall under CPSC children’s product safety jurisdiction under 16 CFR 1500, which covers chemical hazards and physical hazard standards for products used by children under 14. The CPSC recall database (cpsc.gov/Recalls) was checked for Pura Kiki, Philips Avent, and Stokke Munch prior to publication. No active recalls were found for these models as of the date of this review.
The material safety concern most parents ask about is BPA (bisphenol A), a chemical historically used in polycarbonate plastics that the AAP has flagged as an endocrine-disrupting compound of concern. The AAP’s guidance on healthy drinks and container safety recommends minimizing contact between heated liquids and plastic containers when alternatives exist. Stainless steel body cups eliminate that specific concern for the main liquid-contact surface. The remaining plastic-adjacent question is the lid and spout material: medical-grade silicone, used in the Pura Kiki and several competitors, is chemically stable at normal use temperatures and does not contain BPA.
Lead exposure in children’s drinkware is addressed by CPSC standards under 16 CFR 1303 (paint) and CPSIA (Consumer Product Safety Improvement Act), which limits lead content in children’s products. The CDC maintains no safe level of lead exposure for children. For stainless steel cups, lead is not a material input, though solder points on some cheap import cups have historically been a concern. We focus this review on established US-market brands with documented compliance.
Age range for this review is 6 to 36 months, matching the recommended introduction window from the AAP and the manufacturer’s stated range for all products reviewed here.
How we researched the sippy cups
Testing ran from December 2025 through May 2026, with the following structured evaluation:
Leak test: Each cup was filled to capacity, sealed with its lid, placed on its side in a tote bag, and left for 30 minutes. We ran this test 12 times per cup across different temperatures (room temperature and refrigerator-cold liquid). Drips and full leaks were counted separately.
Drop test: Each cup was dropped from counter height (36 inches) onto a tile floor 10 times. We inspected for cracked body, spout deformation, and seal failure.
Material wear test: All cups ran through a standard household dishwasher on the top rack using standard detergent, 3 cycles per week for the full 6-month period. Spouts were inspected monthly for cracking, discoloration, or deformation.
Toddler usability test: Both test children used each cup daily for at least 4 consecutive weeks each. We logged grip success rate, spill events at the mouth, and self-drinking independence milestones.
Cleaning assessment: We timed full disassembly, wash, and reassembly. We noted whether mold appeared in any hidden seams after 3 months.
Who should buy / who should skip
Buy the Pura Kiki if: You want to eliminate plastic from the main liquid-contact surface entirely. You are willing to pay a higher upfront cost for a cup that will serve your child from 6 months through 3 years with lid swaps. You have a child who drops cups frequently (the silicone sleeve absorbs impact without cracking the way a plastic body would).
Buy the Philips Avent Transition Cup if: You are on a tighter budget and need a reliable, well-known brand cup for a child 6 to 18 months. Philips Avent states the cup is free of BPA, and the soft silicone spout is well-calibrated for younger toddlers still learning to sip. At current pricing it is the accessible entry point in this category.
Buy the Stokke Munch if: Design and color matching your kitchen or nursery aesthetic matters to you, and you want a slightly larger opening that makes scrubbing easier. At current pricing you pay for Scandinavian design quality and a notably easy-to-clean interior.
Skip any of these if: Your child is under 6 months. Sippy cups are not appropriate for infants who have not begun solids and who still require bottle or breast as the primary feeding method. Consult your pediatrician before introducing any open cup or sippy cup.
Material safety: stainless steel wins, silicone is solid
The single biggest differentiator in this category is whether the inside of the cup that touches liquid is plastic or not. Stainless steel cups, specifically 18/8 (also called 304) food-grade stainless, have no BPA, phthalates, PVC, or lead as material inputs by composition. That is a structural guarantee, not a manufacturer claim subject to formula changes.
The Pura Kiki body is 18/8 stainless. Liquid inside the cup touches only stainless steel and the silicone spout. There is no plastic liner, no internal coating. That is meaningfully different from plastic cups marketed as free of bisphenol A, which still contain plastics from other chemical families whose long-term safety data is less complete. The AAP’s 2018 guidance encouraged minimizing food and drink contact with plastic containers for infants and young children precisely because of this uncertainty.
The silicone spout on the Pura Kiki is labeled medical-grade by the manufacturer. After 6 months of dishwasher cycles and daily use, the spout showed no cracking and no discoloration. At month 4, we deliberately examined it under strong light for micro-tears, found none. It held its shape through the full 6-month test.
The one honest limitation: you cannot independently verify material composition at home. We rely on manufacturer documentation and the fact that Pura is a US-based brand selling into a regulated market with CPSC oversight. If you want third-party verified material safety, look for cups that carry MADE SAFE certification, which performs independent ingredient screening.
Leak resistance: the real-world test result
In 12 leak tests over 6 months, the Pura Kiki produced zero full leaks and 2 minor drips at the spout hinge when stored on its side for more than 20 minutes. For comparison, the Philips Avent Transition Cup produced 4 drip events and 1 full leak (the lid seal loosened after 4 months of dishwasher use). The Stokke Munch produced 1 drip event across the same test protocol.
For a bag that also holds a phone, keys, and snacks, that distinction matters. The Pura Kiki’s silicone spout uses a compression seal that stays sealed when the cup is not actively in use. You flip the spout cover to open the drinking spout; when it closes, the silicone presses against a silicone rim, not a plastic snap. That silicone-on-silicone seal appears to be more resilient over the long term than the plastic-on-plastic snaps on budget cups.
The 10-drop test revealed zero body damage on any of the three cups. The Pura Kiki’s silicone sleeve visibly absorbed impact; the sound of the drop was noticeably quieter than the Philips Avent cup hitting tile. No spout damage on any cup from drops.
Ease of use: who handles it better, parents or toddlers
Full disassembly and reassembly time for the Pura Kiki clocked at 8 seconds to disassemble and 11 seconds to reassemble once we were familiar with the lid system. The Philips Avent came apart in 6 seconds but the valve piece is smaller and easier to drop down a drain. The Stokke Munch took 14 seconds due to a tighter twist-lock lid, but has fewer small pieces.
Our 14-month-old tester achieved independent drinking from the Pura Kiki sippy spout within 3 days of introduction. She preferred holding the silicone sleeve rather than the stainless body. Our 28-month-old tester was already proficient at sippy cups and had no adjustment period.
The one genuine usability gap with stainless steel cups: you cannot see the liquid level. This is not a safety issue, but it does mean you refill more often than you need to, or you lift the cup to check. Some parents care about this a lot; others do not notice after the first week. We are flagging it as a real behavioral difference from plastic cups where you can see the waterline.
Mold inspection at the 3-month mark found no mold in any of the three cups. At 6 months, the Philips Avent valve showed faint staining on the underside that did not clean out fully in the dishwasher. We recommend pulling the valve manually and scrubbing with a bottle brush at least monthly on any valve-style cup.
Value for money: is the price premium justified
The Pura Kiki 11 oz sippy cup costs roughly twice what the Philips Avent Transition Cup costs. Whether that premium is justified depends on what you are paying for.
If you buy the Pura Kiki base kit, you get the stainless body, a silicone sleeve, and one spout lid. Lid upgrades (bottle nipple, straw lid, sport cap) are sold separately at current pricing tocurrent pricing each. If you use all three lid stages from 6 months to 36 months, you are effectively buying one cup body for 2.5 years. A succession of plastic cups across the same age range can easily exceed that total cost, while also generating more landfill waste.
For a family buying one or two cups, the per-cup price feels high. For a family outfitting a full set of 4 to 6 cups for daycare and home use, the sticker cost adds up quickly, and the Philips Avent budget option becomes genuinely worth considering for the “loses at daycare” cups versus the “home cups” that stay tracked.
The Stokke Munch at current pricing occupies a middle tier that is harder to justify on functional grounds versus the Pura Kiki. The design is genuinely nicer and the interior is easier to clean, but it is plastic-bodied (polypropylene, stated by manufacturer to be free of bisphenol A), so you are paying a premium for aesthetics rather than material safety differentiation.
For a deeper look at how we evaluate all products in this category, see our testing methodology. For more feeding options in this age group, see our nursing and feeding buying guides.