How to Use Rumparooz One Size Cloth Diaper Covers - Lava

By Kanga Care | Published: 2026-10-31

Category: How-to Guides

A step-by-step guide to using and caring for Rumparooz One Size cloth diaper covers in the Lava print, with fit checks and common mistakes to avoid.

Quick answer

Use a Rumparooz One Size cloth diaper cover as a waterproof outer layer over an absorbent insert or flat, setting the rise snaps to your baby's size and checking that all absorbent material stays inside the cover. Wash the cover only when it is soiled or smells, and air-dry it between changes.

Why the cover is the waterproof layer, not the absorbent one

A cloth diaper cover does not absorb urine on its own; it blocks moisture from reaching clothes and bedding. That means the insert or flat underneath does the soaking, and the cover can often be reused for several changes if it stays clean and dry. This is why reusable diaper covers are usually bought in smaller numbers than absorbent diapers. The Lava print is simply a style choice on the same Rumparooz One Size cover, so the fit and care steps below apply to it just as they do to any other color.

When a one size cover may not be the right choice

The Rumparooz One Size cover is designed to start at about 6 pounds and fit up to roughly 35+ pounds using four rise settings. That range covers most babies, but a very small newborn may still look bulky, and a heavy wetter may need more absorbency inside rather than a larger cover. If you are diapering a newborn in the first weeks, a dedicated newborn cover can give a trimmer fit. Also check the cover over your bulkiest nighttime insert before committing to a full stash, because a generously sized cover can still feel tight when you add thick absorbency.

Step-by-step: using and caring for your Lava cover

Set the rise snaps before the first use: Lay the cover flat and snap the rise setting that matches your baby's current size: newborn, small, medium, or large. Start with the setting that gives a snug leg opening without compressing the absorbent insert. Common mistake: leaving the rise on the largest setting for a small baby, which causes gaps at the legs. Recheck the rise every few weeks as your baby grows.
Prepare the absorbent layer: Fold or stuff your insert or flat so it fits inside the cover with no absorbent fabric sticking out at the legs or waist. Any cloth that touches clothing will wick moisture outward. Checkpoint: run a finger around the leg openings to confirm only the cover's waterproof edge is exposed.
Put the cover on over the absorbent layer: Place the absorbent layer against the skin, then pull the cover over it like a pair of underwear. Fasten the waist and legs so the cover sits flat, with no bunched fabric trapped under the leg elastics. Common mistake: fastening too loosely at the legs, which lets urine leak out.
Check the one size cover fit: Look for red marks on the skin, gaps at the legs, or the cover riding down at the back. A good fit leaves light elastic marks that fade within minutes, not deep red lines. If you see gaps, go down a rise setting; if the cover digs in, go up one. Checkpoint: do this fit check before every change for the first week with a new rise setting.
Reuse the cover between washes when it is clean: If the cover is not soiled and does not smell, wipe it inside with a damp cloth and hang it to air-dry before the next change. Rotate two or three covers so each one dries fully. Common mistake: putting a damp cover back on a baby, which can cause irritation.
Wash and dry the cover correctly: Wash covers with your regular cloth diaper load, but avoid bleach and fabric softener, which can damage the waterproof layer. Air-dry the cover or use a low dryer setting; high heat can shorten the life of the waterproofing. Checkpoint: if water beads on the inside after washing, the cover is still working; if it soaks through, it is time to replace it.

Product facts

Rumparooz One Size Cloth Diaper Covers - Lava: The Rumparooz One Size Cloth Diaper Cover has four adjustable rise settings (newborn, small, medium, large) and fits from about 6 pounds to approximately 35+ pounds. You can adjust the same cover as your baby grows instead of buying several sizes, but you need to snap the rise correctly at each stage.
Rumparooz One Size Cloth Diaper Covers - Lava