{"sources":[{"id":"drbrownsbaby-com--drbrowns-natural-flow-level-4-narrow-baby-bottle-silicone-nipple-fast-flow-9mplus-100percent-silicone-bottle-nipple-2-pack:quick:source:0:listing","type":"listing","url":"https://4f71f1-4.myshopify.com/products.json","retrieval_at":"2026-10-11T07:16:33.630Z","source_hash":"143471b0cdbb13870b831ff0eb22ec62d394df84fc545e86c911baf6f10056b4","access_verdict":"permitted","robots_result":"allow"},{"id":"drbrownsbaby-com--drbrowns-natural-flow-level-4-narrow-baby-bottle-silicone-nipple-fast-flow-9mplus-100percent-silicone-bottle-nipple-2-pack:quick:source:2:guide","type":"guide","url":"https://drbrownsbaby.com/products/drbrowns-natural-flow-level-4-narrow-baby-bottle-silicone-nipple-fast-flow-9mplus-100percent-silicone-bottle-nipple-2-pack","retrieval_at":"2026-10-11T18:42:19.239Z","source_hash":"86d3a05f8698618ac3f4a5d7ad0daa19ebdaab2a17d84d9270392021d0ae8777","access_verdict":"permitted","robots_result":"allow"},{"id":"drbrownsbaby-com--drbrowns-natural-flow-level-4-narrow-baby-bottle-silicone-nipple-fast-flow-9mplus-100percent-silicone-bottle-nipple-2-pack:quick:source:3:manual","type":"manual","url":"https://drbrownsbaby.com/pages/instructions","retrieval_at":"2026-10-11T18:42:31.780Z","source_hash":"c437aad77f65c3ca990da139110d2f79b08fba590d0446932422c53ca1b9cbe0","access_verdict":"permitted","robots_result":"allow"},{"id":"drbrownsbaby-com--drbrowns-natural-flow-level-4-narrow-baby-bottle-silicone-nipple-fast-flow-9mplus-100percent-silicone-bottle-nipple-2-pack:quick:source:4:manual","type":"manual","url":"https://www.drbrownsmedical.com/wp-content/uploads/2022/03/Dr.-Browns-Medical-Nipple-Selection-Guide-for-all-Zero-Resistance%E2%84%A2-Bottle-Systems-English.pdf","retrieval_at":"2026-10-11T18:42:34.941Z","source_hash":"ce5561d95b486bfd9b6bfda239745e6d74c71c4a4ad5d4e4a1c36897ac5d6950","access_verdict":"permitted","robots_result":"allow"},{"id":"drbrownsbaby-com--drbrowns-natural-flow-level-4-narrow-baby-bottle-silicone-nipple-fast-flow-9mplus-100percent-silicone-bottle-nipple-2-pack:quick:source:5:review","type":"review","url":"https://www.drbrowns.co.uk/collections/options-teats/products/dr-browns-narrow-neck-options-level-4-teats","retrieval_at":"2026-10-11T18:42:36.578Z","source_hash":"e8dd2911d4e61f7e99c68c2eaafdde5da2716eb4db9a5a0fcf0eff9780d1599d","access_verdict":"permitted","robots_result":"allow"}],"summaries":[{"id":"01M4P5RQM3CNH5NW62R3Q2WYPR","source_id":"drbrownsbaby-com--drbrowns-natural-flow-level-4-narrow-baby-bottle-silicone-nipple-fast-flow-9mplus-100percent-silicone-bottle-nipple-2-pack:quick:source:5:review","kind":"review","text":"Buyers on this page describe the Level 4 flow as a steady but gentle drip that lets a baby take time to swallow rather than being flooded.","locators":{"page":"https://www.drbrowns.co.uk/collections/options-teats/products/dr-browns-narrow-neck-options-level-4-teats"}},{"id":"01M4P5RR02NQPHS6PACTX68B7F","source_id":"drbrownsbaby-com--drbrowns-natural-flow-level-4-narrow-baby-bottle-silicone-nipple-fast-flow-9mplus-100percent-silicone-bottle-nipple-2-pack:quick:source:5:review","kind":"review","text":"One buyer moved to the Level 4 narrow teat from latex vented teats used for cleft palate feeding and reported it suited that use.","locators":{"page":"https://www.drbrowns.co.uk/collections/options-teats/products/dr-browns-narrow-neck-options-level-4-teats"}},{"id":"01M4P5RRCA37QXWBB3KAP52F21","source_id":"drbrownsbaby-com--drbrowns-natural-flow-level-4-narrow-baby-bottle-silicone-nipple-fast-flow-9mplus-100percent-silicone-bottle-nipple-2-pack:quick:source:5:review","kind":"review","text":"The 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are shown on the page and all are positive, so the amount of user feedback is limited.","original_value":"Only three reviews are shown on the page and all are positive, so the amount of user feedback is limited.","confidence":0.7,"citation":{"lineage_tier":"T2","artefact_id":null,"start":null,"end":null,"summary_id":"01M4P5RSHYFJ1BVDMFZZ69M48P","excerpt_id":null,"span_sha256":"06577b5fa28c9ef6e8679b3de96126cfe9207cddfeb497d8cf0e91a5836c8e2e","source_locator":null}},{"id":"01M4P5S2E88D4JR3BW0PNJW97N","source_id":"drbrownsbaby-com--drbrowns-natural-flow-level-4-narrow-baby-bottle-silicone-nipple-fast-flow-9mplus-100percent-silicone-bottle-nipple-2-pack:quick:source:2:guide","field":"flow consistency","ordinal":6,"value_number":null,"unit":null,"value_text":"Flow rates are engineered not to change between nipples of the same level, so a level gives a consistent flow.","original_value":"Each Dr. Brown’s Bottle Nipple is uniquely engineered so that flow rates don’t change between same-level 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fluid loss from the mouth and bottle refusal.","original_value":"• Falling asleep at the start of feedings                • Gulping\n• Hard sounding swallowing                               • Coughing\n• Taking a very long time to eat small amounts           • Choking\n• Fluid loss from mouth                                  • Bottle refusal","confidence":0.9,"citation":{"lineage_tier":"T1","artefact_id":"drbrownsbaby-com--drbrowns-natural-flow-level-4-narrow-baby-bottle-silicone-nipple-fast-flow-9mplus-100percent-silicone-bottle-nipple-2-pack:quick:source:4:manual:artefact:ce5561d95b486bfd9b6bfda239745e6d74c71c4a4ad5d4e4a1c36897ac5d6950","start":2269,"end":2544,"summary_id":null,"excerpt_id":null,"span_sha256":"9ad248639a78aa851154e6f266818b679b94cd7b5c8abe8a15683f4b39342eca","source_locator":"characters 2269 to 2544 of the retained 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out","detail":"Left out: a fact on Level 4 flow quoted from an owner-opinion page; such pages give findings in RoboTrunk's own words only.","recorded_at":"2026-10-11T18:43:18.490Z"},{"id":"01M4P5S4T38RB5VX2QAXDHXA4V","source_type":"review","url":"https://www.drbrowns.co.uk/collections/options-teats/products/dr-browns-narrow-neck-options-level-4-teats","reason":"quoted fact left out","detail":"Left out: a fact on compatibility quoted from an owner-opinion page; such pages give findings in RoboTrunk's own words only.","recorded_at":"2026-10-11T18:43:18.490Z"}],"facet_check":null,"evidence_depth":{"note":"Deep read: the store's own data and 7 outside pages (the store's own product page; maker page; manual; spec sheet; review; regulator recall search (CPSC (United States)); regulator recall search (Health Canada)), each read in full by RoboTrunk and trimmed to its main content, then written up and checked. Facts from the maker or a manual quote the page word for word; what real users report is summarised with a link to the page read. Recall status was checked directly with CPSC (United States), Health Canada: The CPSC recall search for this manufacturer returned an error and no valid record, and the only Health Canada recall naming Dr. Brown's covers Lovey Pacifier & Teether Holders, a different product, not this nipple. No recall applying to this exact model was found. Still open, with no evidence found: What are the exact diameter and height of this nipple?; How often should these silicone nipples be replaced?; Will the nipple fit narrow bottles from other brands, such as Philips Avent?; What is the total weight of the two-nipple pack?; Is the nipple latex-free as well as BPA-free?; Does the pack include the collar and cap or only the nipples?; What warranty does Dr. Brown's offer on this nipple?; What is the measured flow rate of the Level 4 nipple in millilitres per minute?; Can the nipples be washed in a steam sterilizer basket with the collar attached?; Are these nipples sold in packs larger than two?; Do the nipples have a shelf life or expiry date?; Is the nipple compatible with Dr. Brown's glass narrow bottles?.","tier":"complex","depth":"trimmed_read","model":"deepseek-flash","recall":{"note":"The CPSC recall search for this manufacturer returned an error and no valid record, and the only Health Canada recall naming Dr. Brown's covers Lovey Pacifier & Teether Holders, a different product, not this nipple. 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