How to Clean a Waterproof Crib Mattress Cover: Step-by-Step Care

Quick Answer

To clean a waterproof crib mattress cover, remove it and machine wash on a gentle cycle with mild detergent, then air dry or tumble dry on low. Always check the care label first, and avoid bleach or fabric softeners that can break down the waterproof barrier.

A waterproof crib mattress cover is your first line of defense against spills, diaper leaks, and drool. But to keep it working, it needs the right cleaning routine. Here’s a simple, step-by-step guide to washing your cover without damaging its waterproof layer.

Newton Baby makes some of the most popular crib mattresses and covers, including the Essential Waterproof Crib Mattress and the Extra Mini Crib Mattress Cover. While each product has specific instructions, the general principles of cover care apply across brands.

Why Proper Cleaning Matters

The waterproof layer on a crib mattress cover is designed to keep moisture away from the mattress core. If you use harsh detergents, bleach, or fabric softeners, you can break down that layer over time. This means the cover won't repel liquids as effectively, putting the mattress at risk for stains, odors, and even mold.

Regular cleaning also keeps the sleep surface hygienic for your baby, who spends a lot of time in the crib. A clean cover reduces exposure to allergens, bacteria, and the lingering smells of milk, sweat, and diaper ointment. The good news is that most waterproof covers are machine washable, making upkeep easy.

• Always check the care label before washing—some covers have special instructions.
• Wash your cover every time it gets soiled, and at least once a week for general freshness.

Step-by-Step Washing Instructions

Start by removing the cover from the mattress. If there are any large stains, pre-treat them with a gentle stain remover or a small amount of baby-safe detergent, then let it sit for a few minutes.

Place the cover in the washing machine with cold or warm water on a gentle cycle. Use a mild, liquid detergent—avoid powders that might leave residue. Do not use bleach or fabric softener, as these can damage the waterproof coating.

After washing, remove the cover promptly to prevent mildew. You can air dry it flat or hang it. If you use a dryer, choose the lowest heat setting and remove it while it's still slightly damp—overheating can degrade the waterproof barrier.

• For stubborn stains, soak the cover in cold water and a little detergent for 15–30 minutes before washing.
• Skip the dryer whenever possible; air drying is gentler on the waterproof layer.

Common Mistakes to Avoid

One of the biggest mistakes is using fabric softener—it leaves a coating that can reduce absorbency and clog the cover's breathable pores. Similarly, bleach can eat away at the waterproof membrane, causing it to crack or peel over time.

Another mistake is drying on high heat, which can melt or warp the waterproof backing. Always opt for low heat or air drying. And don’t iron the cover—heat can ruin the waterproof layer permanently.

• Never iron a waterproof crib mattress cover.
• Avoid wringing the cover out—it can distort the shape. Instead, gently press out excess water.

Final Wash-and-Care Checklist

1. Check the label and pre-treat: Look for specific care instructions on the cover's tag. Pre-treat any stains with a gentle detergent or baby-safe stain remover. Checkpoint: You're sure the cover is safe to machine wash and you've spotted the best stain-removal method.
2. Machine wash on gentle: Use cold or warm water, a mild liquid detergent, and skip bleach and fabric softeners to protect the waterproof layer. Checkpoint: Your machine is set to gentle, and you haven't added any harsh additives.
3. Dry flat or low heat: Air dry when possible, or tumble dry on the lowest heat setting. Remove the cover promptly and while slightly damp to prevent mildew. Verdict: A carefully dried cover retains its waterproofing and stays soft for baby.

Product-Specific Care Notes

• Essential Waterproof Crib Mattress: Our ultra-breathable, washable & waterproof crib mattress is 4 inches thick and features a soft, eyelet removable cover with a waterproof lining on one side. The removable cover makes cleaning straightforward: you can unzip it and machine wash it, while the waterproof lining protects the mattress core.
• Extra Mini Crib Mattress Cover: Be prepared. Our ultra-breathable & washable soft, single layer eyelet cover is designed to quickly replace the Mini Crib Mattress cover when accidents happen. Cover fits the Newton Mini Crib Mattress ONLY. Does not fit other mini crib mattresses. Wovenaire® Core not included. Having a spare cover on hand means you can swap it out instantly and wash the soiled one without making baby wait—especially handy for nighttime accidents.

Cleaning a waterproof crib mattress cover doesn't have to be complicated. Stick to gentle detergents, avoid heat and harsh chemicals, and check the care label every time. With these steps, your cover will stay fresh, functional, and ready for the next mess.