これ便利そうでいいな(;´Д`) https://jp.shein.com/Nipple-Ruler-Nipple-Ruler-Flange-Size-Measurement-Tool-Silicone-And-Soft-Flange-Size-Measurement-Nipple-Breast-Flange-Measurement-Tool-Breast-Pump-Size-Tool-Essential-Tools-For-New-Mothers-p-32232566.html