Asked at the nook
Questions mothers ask us
The same questions come up at 3 a.m. in every house. Here are our answers, grouped so you can jump straight to yours.
Fit & sizing
01Which pumps do Nursi Luna flange inserts fit?
They are made for 24mm shields and fit most 24mm shields for electric, wearable and manual pumps. Mothers tell us they use them in Medela, Spectra, BabyBuddha and Momcozy shields. They are not designed for 27–28mm shields.
02How do I know which insert size to use?
Measure the nipple (not the areola) with the ruler before pumping, then add about 2–4mm. A 16mm nipple usually does well in a 19mm insert. Our flange size guide walks through it step by step, and the size finder on this page does the arithmetic.
03Can each side use a different size?
Yes, and many mothers need exactly that. Every insert kit holds two of each size, so the left and right can wear different inserts.
04What if I am between two sizes?
Start with the larger of the two and pump for a few sessions. If the areola is being drawn into the tunnel, move down one size. Comfort is the tiebreaker.
Care
05How often should inserts be replaced?
Silicone softens and stretches with daily use. We recommend a fresh pair roughly every one to two months, or sooner if the seal feels weaker.
06How do I clean the inserts?
Wash them with warm soapy water and the sponge brush in the kit, run them on the top rack of the dishwasher, or boil them with the rest of your pump parts.
07Can the inserts go in a steriliser?
Yes. They are food-grade silicone and handle boiling water, steam sterilisers and microwave steam bags.
Pumps & parts
08Are the Spectra parts original Spectra parts?
No. They are made by Nursi Luna to fit Spectra S1, S2 and 9 Plus pumps. They are food-grade, BPA-free silicone and the tubing is longer than the original.
09How often should I change valves and membranes?
Valves every one to three months, membranes and backflow protectors every two to three, sooner if you pump often. Our replacement guide has the details.
10Does the wearable pump come with inserts?
Yes, 15, 17, 19 and 21mm inserts are in the box, along with milk storage bags.
Orders
11Where do I track or return an order?
In your account at the store where you ordered. Orders, delivery, returns and warranty all run through that store.
12Why does the price change?
Prices are set by the store and can move day to day. The price you see at checkout is the one that counts.