{
  "schema_version": "compare-page.v2",
  "page_id": "choosing-a-breast-pump-flange-size",
  "url": "https://robotrunk.com/compare/want/choosing-a-breast-pump-flange-size",
  "title": "Choosing a breast pump flange size",
  "question": "How can a shopper tell which breast pump flange size fits them?",
  "answer": "Haakaa E-Ladybug: Measure nipple diameter at the base in millimetres without the areola, then use the included guide; there should be about 1–4 mm of space between nipple and flange tunnel.\nWillow Pump Willow Sizing Insert Set: Sizes offered are 13mm, 15mm, 17mm, 19mm, 21mm and 27mm. They are designed for the perfect fit and performance with Willow and make pumping more comfortable for mamas with smaller flange sizes.",
  "kind": "breastfeeding supply",
  "market": "US",
  "generated_at": "2026-10-26T22:29:19.396Z",
  "columns": [
    "Fit guidance",
    "Size options",
    "Purpose"
  ],
  "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.f2",
      "product": "Willow Pump Willow Sizing Insert Set",
      "field": "Purpose",
      "value": "They are designed for the perfect fit and performance with Willow and make pumping more comfortable for mamas with smaller flange sizes.",
      "stated_as": "Designed for the perfect fit and performance with Willow, Sizing Inserts make pumping more comfortable for mamas with smaller flange sizes.",
      "source_type": "listing",
      "source_url": "https://willowpump.myshopify.com/products.json",
      "source_read_at": "2026-10-11T07:27:24.617Z"
    },
    {
      "ref": "p1.f3",
      "product": "Willow Pump Willow Sizing Insert Set",
      "field": "Available sizes",
      "value": "Sizes offered are 13mm, 15mm, 17mm, 19mm, 21mm and 27mm.",
      "stated_as": "Variant: 27mm | 10.99 USD | SKU S827",
      "source_type": "listing",
      "source_url": "https://willowpump.myshopify.com/products.json",
      "source_read_at": "2026-10-11T07:27:24.617Z"
    },
    {
      "ref": "p4.f10",
      "product": "Haakaa E-Ladybug",
      "field": "Flange sizing",
      "value": "Measure nipple diameter at the base in millimetres without the areola, then use the included guide; there should be about 1–4 mm of space between nipple and flange tunnel.",
      "stated_as": "Using the provided Nipple Measurer, a ruler, or a measuring tape, measure the diameter of your nipple at the base in millimetres. Do not include your areola.Based on your measurement, determine your flange size using the guide included in the box. There should be approximately 1–-4mm of space between your nipple and the sides of the flange tunnel.",
      "source_type": "manual",
      "source_url": "https://www.haakaa.co.nz/products/e-ladybug-wearable-electric-breast-pump",
      "source_read_at": "2026-10-12T11:58:14.624Z"
    }
  ],
  "rows": [
    {
      "rank": 1,
      "merchant": {
        "slug": "haakaausa-com",
        "display_name": "haakaausa.com"
      },
      "product_id": "gid://shopify/Product/9185250869486",
      "name": "Haakaa E-Ladybug",
      "url": "/products/ucp/haakaausa-com/9185250869486",
      "why": "Measure nipple diameter at the base in millimetres without the areola, then use the included guide; there should be about 1–4 mm of space between nipple and flange tunnel.",
      "cells": [
        {
          "column": "Fit guidance",
          "fact": {
            "field": "Flange sizing",
            "value": "Measure nipple diameter at the base in millimetres without the areola, then use the included guide; there should be about 1–4 mm of space between nipple and flange tunnel.",
            "stated_as": "Using the provided Nipple Measurer, a ruler, or a measuring tape, measure the diameter of your nipple at the base in millimetres. Do not include your areola.Based on your measurement, determine your flange size using the guide included in the box. There should be approximately 1–-4mm of space between your nipple and the sides of the flange tunnel.",
            "source_type": "manual",
            "source_url": "https://www.haakaa.co.nz/products/e-ladybug-wearable-electric-breast-pump",
            "source_read_at": "2026-10-12T11:58:14.624Z"
          }
        },
        {
          "column": "Size options",
          "fact": null
        },
        {
          "column": "Purpose",
          "fact": null
        }
      ]
    },
    {
      "rank": 2,
      "merchant": {
        "slug": "onewillow-com",
        "display_name": "onewillow.com"
      },
      "product_id": "gid://shopify/Product/6552686755933",
      "name": "Willow Pump Willow Sizing Insert Set",
      "url": "/products/ucp/onewillow-com/6552686755933",
      "why": "They are designed for the perfect fit and performance with Willow and make pumping more comfortable for mamas with smaller flange sizes.",
      "cells": [
        {
          "column": "Fit guidance",
          "fact": null
        },
        {
          "column": "Size options",
          "fact": {
            "field": "Available sizes",
            "value": "Sizes offered are 13mm, 15mm, 17mm, 19mm, 21mm and 27mm.",
            "stated_as": "Variant: 27mm | 10.99 USD | SKU S827",
            "source_type": "listing",
            "source_url": "https://willowpump.myshopify.com/products.json",
            "source_read_at": "2026-10-11T07:27:24.617Z"
          }
        },
        {
          "column": "Purpose",
          "fact": {
            "field": "Purpose",
            "value": "They are designed for the perfect fit and performance with Willow and make pumping more comfortable for mamas with smaller flange sizes.",
            "stated_as": "Designed for the perfect fit and performance with Willow, Sizing Inserts make pumping more comfortable for mamas with smaller flange sizes.",
            "source_type": "listing",
            "source_url": "https://willowpump.myshopify.com/products.json",
            "source_read_at": "2026-10-11T07:27:24.617Z"
          }
        }
      ]
    }
  ]
}