Why Does My Baby's Nappy Smell After Washing?
By LittleLamb | Published: 2026-10-18
Category: Product Reviews
Persistent odour in cloth nappies after washing is usually caused by detergent buildup or insufficient rinsing. Here's how to diagnose and fix the problem.
Quick Answer
If your cloth nappies smell after washing, the culprit is almost always detergent residue or mineral buildup trapped in the fabric. A targeted strip wash or a switch to a nappy booster pad can restore freshness.
Why Detergent Buildup Causes Smell
Modern washing machines often use too much detergent or insufficient water for cloth nappies. The leftover detergent traps bacteria and urine salts, creating that ammonia-like odour even after a full cycle. Hard water minerals can also bind to fibres, making the problem worse.
The Role of Absorbency Layers
Thicker inserts and boosters hold more moisture, which is great for heavy wetters but can also trap odour-causing residues if not rinsed thoroughly. A slim-fitting booster like the Reusable Bamboo Booster Triple'r is designed to dry quickly, reducing the chance of lingering smells.
Diagnosis: Why Your Nappy Smells After Washing
- Symptom: A strong ammonia or sour smell on clean nappies, especially when they get wet again. Check if the smell appears only after use or right out of the wash.
- Likely Cause: Detergent buildup from using too much detergent, hard water minerals, or a wash cycle that is too short or cold. Try a strip wash with hot water and no detergent to remove residue.
- Corrective Action: Run a hot wash (60°C / 140°F) with an extra rinse cycle. Use half the recommended detergent. For persistent odour, add a cup of white vinegar to the rinse cycle. After stripping, test by sniffing the dry nappy. If odour remains, the issue may be mineral buildup.
- When to Stop or Choose Another Option: If stripping does not resolve the smell after two attempts, consider switching to a nappy booster pad made from bamboo, which resists odour better than synthetic materials. Replace any inserts that still smell after stripping. Persistent odour after stripping indicates the fabric is compromised. A new booster pad is a reliable fix.
Product Facts
- Reusable Bamboo Booster Triple'r 5 pack: Quick Drying Design: Liquids absorb quickly into the bamboo fabric, while the innovative loop towelling maximises space between fibres for optimal absorption. Faster drying means less time for bacteria to multiply, which directly reduces odour buildup between washes.
Reusable Bamboo Booster Triple'r 5 pack
