{
  "schema_version": "compare-page.v2",
  "page_id": "breast-shield-sizes-for-a-proper-nipple-fit",
  "url": "https://robotrunk.com/compare/want/breast-shield-sizes-for-a-proper-nipple-fit",
  "title": "Breast shield sizes for a proper nipple fit",
  "question": "Which breast shield sizes fit a nipple properly?",
  "answer": "MEDELA PersonalFit Flex™ Breast Shields: Sizes range from S 21 mm through XXL 36 mm. The shields adjust to the user's shape.\nMedela Harmony® Breast Pump with PersonalFit Flex™: The supplied shield is 24 mm; nipple diameter should be measured and the selected shield should be slightly larger than the nipple. PersonalFit Flex shields in 21, 24, 27 and 30 mm are listed as separately sold accessories.\nMedela Personal Fit Flex Breast Shield: The quoted variant is 24 mm. Its flexible oval form rotates 360 degrees and adapts to the body.\nMedela Personal Fit Flex Breast Shields: The quoted variant is 27 mm.\nMedela PersonalFit Breast Shields: The shields are 36 mm.\nMEDELA Pump In Style Advanced Double Pumping Kit: The included breast shields are 24 mm.",
  "kind": "breastfeeding",
  "market": "US",
  "generated_at": "2026-10-25T21:03:04.084Z",
  "columns": [
    "Size",
    "Fit",
    "Adjustment"
  ],
  "notices": {
    "facts": "Every value in the table is a fact RoboTrunk checked, linked to the page it came from. A dash means no checked fact fills that cell.",
    "price": "Prices and stock change, so this page prints neither: each product name links to its RoboTrunk page, which shows them live."
  },
  "cited_facts": [
    {
      "ref": "p1.f1",
      "product": "Medela Personal Fit Flex Breast Shield",
      "field": "Sizes",
      "value": "The quoted variant is 24 mm.",
      "stated_as": "Variant: 24 mm",
      "source_type": "listing",
      "source_url": "https://anb-baby.myshopify.com/products.json",
      "source_read_at": "2026-09-23T19:03:51.372Z"
    },
    {
      "ref": "p1.f2",
      "product": "Medela Personal Fit Flex Breast Shield",
      "field": "Adjustment",
      "value": "Its flexible oval form rotates 360 degrees and adapts to the body.",
      "stated_as": "its flexible oval shape can be rotated 360 degrees and adapts to your body",
      "source_type": "listing",
      "source_url": "https://anb-baby.myshopify.com/products.json",
      "source_read_at": "2026-09-23T19:03:51.372Z"
    },
    {
      "ref": "p2.f1",
      "product": "Medela Personal Fit Flex Breast Shields",
      "field": "Sizes",
      "value": "The quoted variant is 27 mm.",
      "stated_as": "Variant: 27 MM",
      "source_type": "listing",
      "source_url": "https://anb-baby.myshopify.com/products.json",
      "source_read_at": "2026-09-23T19:03:51.372Z"
    },
    {
      "ref": "p3.f1",
      "product": "MEDELA PersonalFit Flex™ Breast Shields",
      "field": "Sizes",
      "value": "Sizes range from S 21 mm through XXL 36 mm.",
      "stated_as": "S - 21mm — M - 24mm — L - 27mm — XL - 30mm — XXL - 36 mm",
      "source_type": "listing",
      "source_url": "https://anb-baby.myshopify.com/products.json",
      "source_read_at": "2026-09-23T19:03:51.372Z"
    },
    {
      "ref": "p3.f2",
      "product": "MEDELA PersonalFit Flex™ Breast Shields",
      "field": "Fit",
      "value": "The shields adjust to the user's shape.",
      "stated_as": "the PersonalFit Flex™ shields adjust to your unique shape",
      "source_type": "listing",
      "source_url": "https://anb-baby.myshopify.com/products.json",
      "source_read_at": "2026-09-23T19:03:51.372Z"
    },
    {
      "ref": "p4.f1",
      "product": "Medela PersonalFit Breast Shields",
      "field": "Size",
      "value": "The shields are 36 mm.",
      "stated_as": "Medela PersonalFit Breast Shields 36 mm",
      "source_type": "listing",
      "source_url": "https://anb-baby.myshopify.com/products.json",
      "source_read_at": "2026-09-23T19:03:51.372Z"
    },
    {
      "ref": "p5.f4",
      "product": "Medela Harmony® Breast Pump with PersonalFit Flex™",
      "field": "Compatible shield sizes",
      "value": "PersonalFit Flex shields in 21, 24, 27 and 30 mm are listed as separately sold accessories.",
      "stated_as": "PersonalFit Flex breast shield sizes S (21 mm), M (24 mm), L (27 mm), XL (30 mm)",
      "source_type": "manual",
      "source_url": "https://www.medela.com/010-products/010-pumps/030-manual/010-harmony---manual-breast-pump/pdf-downloads/101041805-2021-05-b-harmony_flex_ifu_en_es_pt_ar_he-low.pdf",
      "source_read_at": "2026-09-25T10:30:33.111Z"
    },
    {
      "ref": "p5.f8",
      "product": "Medela Harmony® Breast Pump with PersonalFit Flex™",
      "field": "Shield fit",
      "value": "The supplied shield is 24 mm; nipple diameter should be measured and the selected shield should be slightly larger than the nipple.",
      "stated_as": "For proper sizing, measure the diameter of your nipple ( ¢7-01).\n2. Select the breast shield that is slightly larger than your nipple",
      "source_type": "manual",
      "source_url": "https://www.medela.com/040-services/manual-instructions/manual-breast-pump-manuals-instructions/harmony-breast-pump.pdf",
      "source_read_at": "2026-09-25T10:30:13.188Z"
    },
    {
      "ref": "p5.f12",
      "product": "Medela Harmony® Breast Pump with PersonalFit Flex™",
      "field": "Position adjustment",
      "value": "The oval shield rotates through 360 degrees so it can be positioned for comfort.",
      "stated_as": "The oval breast shields can be rotated (360°) and placed in the desired position\n        to have the most comfortable fit for you.",
      "source_type": "manual",
      "source_url": "https://www.medela.com/040-services/manual-instructions/manual-breast-pump-manuals-instructions/harmony-breast-pump.pdf",
      "source_read_at": "2026-09-25T10:30:13.188Z"
    },
    {
      "ref": "p6.f4",
      "product": "MEDELA Pump In Style Advanced Double Pumping Kit",
      "field": "Shield size",
      "value": "The included breast shields are 24 mm.",
      "stated_as": "24 mm PersonalFit™ breast shields",
      "source_type": "listing",
      "source_url": "https://anb-baby.myshopify.com/products.json",
      "source_read_at": "2026-09-23T19:03:51.372Z"
    }
  ],
  "rows": [
    {
      "rank": 1,
      "merchant": {
        "slug": "anbbaby-com",
        "display_name": "anbbaby.com"
      },
      "product_id": "gid://shopify/Product/4007253540950",
      "name": "MEDELA PersonalFit Flex™ Breast Shields",
      "url": "/products/ucp/anbbaby-com/4007253540950",
      "why": "Sizes range from S 21 mm through XXL 36 mm.",
      "cells": [
        {
          "column": "Size",
          "fact": {
            "field": "Sizes",
            "value": "Sizes range from S 21 mm through XXL 36 mm.",
            "stated_as": "S - 21mm — M - 24mm — L - 27mm — XL - 30mm — XXL - 36 mm",
            "source_type": "listing",
            "source_url": "https://anb-baby.myshopify.com/products.json",
            "source_read_at": "2026-09-23T19:03:51.372Z"
          }
        },
        {
          "column": "Fit",
          "fact": {
            "field": "Fit",
            "value": "The shields adjust to the user's shape.",
            "stated_as": "the PersonalFit Flex™ shields adjust to your unique shape",
            "source_type": "listing",
            "source_url": "https://anb-baby.myshopify.com/products.json",
            "source_read_at": "2026-09-23T19:03:51.372Z"
          }
        },
        {
          "column": "Adjustment",
          "fact": null
        }
      ]
    },
    {
      "rank": 2,
      "merchant": {
        "slug": "anbbaby-com",
        "display_name": "anbbaby.com"
      },
      "product_id": "gid://shopify/Product/6560312754262",
      "name": "Medela Harmony® Breast Pump with PersonalFit Flex™",
      "url": "/products/ucp/anbbaby-com/6560312754262",
      "why": "The supplied shield is 24 mm; nipple diameter should be measured and the selected shield should be slightly larger than the nipple.",
      "cells": [
        {
          "column": "Size",
          "fact": {
            "field": "Compatible shield sizes",
            "value": "PersonalFit Flex shields in 21, 24, 27 and 30 mm are listed as separately sold accessories.",
            "stated_as": "PersonalFit Flex breast shield sizes S (21 mm), M (24 mm), L (27 mm), XL (30 mm)",
            "source_type": "manual",
            "source_url": "https://www.medela.com/010-products/010-pumps/030-manual/010-harmony---manual-breast-pump/pdf-downloads/101041805-2021-05-b-harmony_flex_ifu_en_es_pt_ar_he-low.pdf",
            "source_read_at": "2026-09-25T10:30:33.111Z"
          }
        },
        {
          "column": "Fit",
          "fact": {
            "field": "Shield fit",
            "value": "The supplied shield is 24 mm; nipple diameter should be measured and the selected shield should be slightly larger than the nipple.",
            "stated_as": "For proper sizing, measure the diameter of your nipple ( ¢7-01).\n2. Select the breast shield that is slightly larger than your nipple",
            "source_type": "manual",
            "source_url": "https://www.medela.com/040-services/manual-instructions/manual-breast-pump-manuals-instructions/harmony-breast-pump.pdf",
            "source_read_at": "2026-09-25T10:30:13.188Z"
          }
        },
        {
          "column": "Adjustment",
          "fact": {
            "field": "Position adjustment",
            "value": "The oval shield rotates through 360 degrees so it can be positioned for comfort.",
            "stated_as": "The oval breast shields can be rotated (360°) and placed in the desired position\n        to have the most comfortable fit for you.",
            "source_type": "manual",
            "source_url": "https://www.medela.com/040-services/manual-instructions/manual-breast-pump-manuals-instructions/harmony-breast-pump.pdf",
            "source_read_at": "2026-09-25T10:30:13.188Z"
          }
        }
      ]
    },
    {
      "rank": 3,
      "merchant": {
        "slug": "anbbaby-com",
        "display_name": "anbbaby.com"
      },
      "product_id": "gid://shopify/Product/4007253508182",
      "name": "Medela Personal Fit Flex Breast Shield",
      "url": "/products/ucp/anbbaby-com/4007253508182",
      "why": "The quoted variant is 24 mm.",
      "cells": [
        {
          "column": "Size",
          "fact": {
            "field": "Sizes",
            "value": "The quoted variant is 24 mm.",
            "stated_as": "Variant: 24 mm",
            "source_type": "listing",
            "source_url": "https://anb-baby.myshopify.com/products.json",
            "source_read_at": "2026-09-23T19:03:51.372Z"
          }
        },
        {
          "column": "Fit",
          "fact": null
        },
        {
          "column": "Adjustment",
          "fact": {
            "field": "Adjustment",
            "value": "Its flexible oval form rotates 360 degrees and adapts to the body.",
            "stated_as": "its flexible oval shape can be rotated 360 degrees and adapts to your body",
            "source_type": "listing",
            "source_url": "https://anb-baby.myshopify.com/products.json",
            "source_read_at": "2026-09-23T19:03:51.372Z"
          }
        }
      ]
    },
    {
      "rank": 4,
      "merchant": {
        "slug": "anbbaby-com",
        "display_name": "anbbaby.com"
      },
      "product_id": "gid://shopify/Product/4007253573718",
      "name": "Medela Personal Fit Flex Breast Shields",
      "url": "/products/ucp/anbbaby-com/4007253573718",
      "why": "The quoted variant is 27 mm.",
      "cells": [
        {
          "column": "Size",
          "fact": {
            "field": "Sizes",
            "value": "The quoted variant is 27 mm.",
            "stated_as": "Variant: 27 MM",
            "source_type": "listing",
            "source_url": "https://anb-baby.myshopify.com/products.json",
            "source_read_at": "2026-09-23T19:03:51.372Z"
          }
        },
        {
          "column": "Fit",
          "fact": null
        },
        {
          "column": "Adjustment",
          "fact": null
        }
      ]
    },
    {
      "rank": 5,
      "merchant": {
        "slug": "anbbaby-com",
        "display_name": "anbbaby.com"
      },
      "product_id": "gid://shopify/Product/1706915299428",
      "name": "Medela PersonalFit Breast Shields",
      "url": "/products/ucp/anbbaby-com/1706915299428",
      "why": "The shields are 36 mm.",
      "cells": [
        {
          "column": "Size",
          "fact": {
            "field": "Size",
            "value": "The shields are 36 mm.",
            "stated_as": "Medela PersonalFit Breast Shields 36 mm",
            "source_type": "listing",
            "source_url": "https://anb-baby.myshopify.com/products.json",
            "source_read_at": "2026-09-23T19:03:51.372Z"
          }
        },
        {
          "column": "Fit",
          "fact": null
        },
        {
          "column": "Adjustment",
          "fact": null
        }
      ]
    },
    {
      "rank": 6,
      "merchant": {
        "slug": "anbbaby-com",
        "display_name": "anbbaby.com"
      },
      "product_id": "gid://shopify/Product/1706916675684",
      "name": "MEDELA Pump In Style Advanced Double Pumping Kit",
      "url": "/products/ucp/anbbaby-com/1706916675684",
      "why": "The included breast shields are 24 mm.",
      "cells": [
        {
          "column": "Size",
          "fact": {
            "field": "Shield size",
            "value": "The included breast shields are 24 mm.",
            "stated_as": "24 mm PersonalFit™ breast shields",
            "source_type": "listing",
            "source_url": "https://anb-baby.myshopify.com/products.json",
            "source_read_at": "2026-09-23T19:03:51.372Z"
          }
        },
        {
          "column": "Fit",
          "fact": null
        },
        {
          "column": "Adjustment",
          "fact": null
        }
      ]
    }
  ]
}