How to Wash Pajamas Properly (and Prevent Shrinking)

There's a certain heartbreak in pulling your favorite pajamas from the dryer only to find them a size smaller than when they went in. Great sleepwear is an investment in comfort, ritual, and the quality of your rest, and knowing how to care for it properly makes that investment last. Whether you’re washing a heritage-quality cotton set, a delicate silk piece, or snug-fit pajamas for little ones, the right laundering makes all the difference.

Washing pajamas with care just requires knowing what your fabric needs, when to opt for the gentle cycle, and which dryer settings are worth avoiding. Laundering premium sleepwear the right way means you’ll enjoy your thoughtfully crafted pajamas for years to come. Here’s everything you need to know.

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To wash pajamas properly and prevent shrinking: turn them inside out, wash in cold water on a gentle cycle with a mild detergent, and avoid high heat in the dryer, opting instead for low heat or air-drying flat. Always check the care label first, as fabric type determines the best method. Machine washing on warm or hot with regular agitation is the leading cause of pajama shrinkage.

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Start Here: Read the Care Label

Before anything else, check the care label ahead of washing your sleepwear. It’s the single most authoritative source of information about your pajamas and also the most consistently ignored.

Care labels use a standardized set of symbols that take the guesswork out of laundry. Common symbols include:

Tub icon: Machine wash. The number inside indicates the maximum water temperature in Celsius.
Tub with hand: Hand wash only.
Tub with X: Do not wash. Dry clean only.
Square with circle: Tumble dry. Dots inside indicate heat level (one dot for low, two for medium).
Circle alone: Dry clean.
X through any symbol: Avoid doing what’s crossed out.

Beyond symbols, the care label will list fabric composition, which determines water temperature, cycle choice, and whether your dryer should be avoided. When in doubt, default to the gentlest care option, such as washing on a gentle cycle with cold water.

How to Wash Cotton Pajamas

Cotton is the most forgiving of luxury fabrics, but it still rewards careful handling. Heat is the enemy of cotton pajamas, whether they’re crafted from Peruvian Pima cotton, lightweight Pima, or woven twill.

Step by step:

Turn pajamas inside out. This protects color, printed details, and the surface finish of the weave from friction during the wash cycle.
Wash in cold water on a gentle or permanent press cycle. Cold water is the single most effective way to help avoid shrinkage. Always wash your pajamas with items of similar color.
Use a mild, fragrance-free liquid detergent. Avoid powder detergents, which can leave residue in fine weaves, and skip anything with optical brighteners if your pajamas are colored or printed.
Wash with similarly delicate items. Avoid pairing with denim, towels, or anything with zippers or Velcro, as these items can create friction that causes pilling and snags.

How to Wash Silk Pajamas

Silk sleepwear requires deliberate attention. The fibers are fine, the weave is delicate, and the consequences of rough handling are immediate and often irreversible. Treat silk with care, and it will reward you with decades of beauty.

Hand-washing is preferable for silk garments:

Fill a clean basin with cool water. Never warm or hot water.
Add silk-specific or pH-neutral detergent. Standard detergents are too alkaline and will break down silk fibers over time.
Submerge the garment and gently swish for one to two minutes. Do not scrub or twist.
Rinse thoroughly in cool water until all detergent is removed.
Do not wring out. Instead, press the garment gently between two clean, dry towels to absorb excess water.
Lay flat to air dry, away from direct sunlight. Sunlight degrades silk fibers and fades color.

If machine washing silk designs, use only a dedicated silk or delicate cycle. Place the garment in a mesh laundry bag, and select the coldest water temperature available.

Never put silk in the dryer. Any amount of heat will damage the fiber structure and dull the luminous finish that makes silk so precious.

How to Wash Children’s and Baby Pajamas

Children’s sleepwear requires a few additional considerations beyond standard fabric care, primarily because of flame-resistant characteristics required for the garments.

No bleach: Bleach can degrade both the fabric and its flame-retardant properties.
No fabric softener: This leaves a coating on fibers that can reduce flame resistance, and high-quality Pima cotton is naturally soft and doesn't need it.
Fragrance-free detergent: Babies and young children have sensitive skin, so a gentle, fragrance-free formula is safest.

To wash children’s and baby pajamas, use cold or warm water on a gentle cycle. Treat stains promptly with a mild stain remover safe for delicates, and avoid applying heat until the stain is fully removed, as heat sets stains permanently.

For babies and infants, wash garments after every wear. Children’s skin is more sensitive, and the combination of body heat, moisture, and proximity to the fabric makes freshness essential.

The Real Reason Pajamas Shrink (and How to Prevent It)

Natural fibers like Pima cotton are made up of cellulose strands that relax and expand during wear. When exposed to heat, those strands contract, pulling the fabric inward. Repeat the process enough times, and a perfectly fitted pajama set loses that perfect fit.

The three main causes of shrinking:

Hot wash water: Anything above cold accelerates fiber contraction. Warm water causes modest shrinkage, and hot causes significant and immediate shrinkage.
High dryer heat: The dryer is where most shrinkage actually happens. High heat is aggressive, fast, and cumulative.
Over-drying: Even on low heat, leaving pajamas in the dryer past the point of dryness continues to stress fibers unnecessarily.

Pre-shrunk fabrics have been pre-treated to reduce further shrinkage, but it doesn’t prevent it entirely. Pre-shrunk 100% cotton will typically shrink 3–5% upon laundering and benefits from cold-water care.

Drying Pajamas the Right Way

High heat and excessive tumbling are responsible for a great deal of ruined sleepwear.

For cotton pajama sets: Tumble drying on low heat is acceptable. Remove the pajamas while they’re still slightly damp, then lay flat or hang immediately. This stops the shrinkage process before fibers over-contract, it prevents wrinkles from setting in, and it preserves the drape and shape of the garment.
For silk and delicates: Air dry only. Lay flat on a clean, dry surface away from direct sunlight and heat sources. Never hang silk while wet, as the water’s weight will stretch the fabric irreparably.
Air drying flat vs. hanging: For most pajama sets, flat drying is gentler than hanging, which can distort shoulder seams and stretch fabric under its own weight. If hanging, use a padded hanger, and smooth the garment into shape before it dries.
On storage: Once dry, fold cotton pajamas rather than hanging them when possible. This prevents the subtle stretching that comes from fabric bearing its own weight over time. Silk can be loosely folded in a breathable fabric bag.

Try this: For cotton pajama sets, remove from the dryer while still slightly damp and lay flat or hang immediately. It prevents wrinkles and preserves the fit.

How Often Should You Wash Pajamas?

The answer is different for adults and children. For all ages, silk sleepwear requires extra caution.

Adults: Every two to three wears is the general standard. Pajamas are typically worn in a clean environment, against clean skin, while at rest, so they accumulate far less bacteria and debris than daytime clothing. Over-washing is as damaging to fine fabrics as under-washing, and washing less frequently is a part of caring for premium sleepwear.
Children and babies: Wash after every wear. Young children perspire more, move more, and are more prone to nighttime accidents and spills. For infants especially, freshness is a hygiene and comfort issue.
Silk pajamas: Silk benefits from infrequent washing. Air the garment out between wears. Hang it in a well-ventilated space away from humidity and direct light, and wash only when genuinely needed.

Every wash cycle, even a gentle one, is a mechanical stress event for fabric. The cumulative effect of unnecessary washing shortens the life of even the finest sleepwear. Wash when needed, and follow proper care instructions each time.

Treating Stains on Pajamas Without Damaging the Fabric

Speed matters when it comes to stains. A stain treated within minutes is dramatically easier to remove than one that has had hours to set. One that has been through a hot dryer may be permanent.

The general approach:

Act immediately. Blot (don’t rub) with a clean cloth to absorb as much of the stain as possible before it penetrates the fibers.
Rinse with cold water from the back of the fabric, pushing the stain out rather than further in.
Apply a gentle stain remover or a drop of mild liquid detergent directly to the area. Let it sit for 5–10 minutes.
Rinse thoroughly and assess before washing further.

What to avoid:

Bleach on any colored, printed, or silk fabric, as this can strip dye and weaken fibers.
Heat of any kind before the stain is fully removed. Heat bonds the stain to the fiber permanently.
Scrubbing, which spreads stains and damages the surface of fine weaves.

For silk stains:

Handle with particular care. Blot only, use cold water only, and for anything stubborn or set-in, consult a professional dry cleaner who specializes in delicates.

Special Care for Robes, Nightgowns, and Accessories

The main rules for pajama care apply across many types of sleepwear and loungewear, with a few category-specific notes.

Robes: Most cotton and terry robes follow standard cotton care and do best with a gentle cycle, cold water, and low heat or air drying. Pay attention to the belt and its ties; remove or secure them before washing to prevent tangling. Terry robes can handle slightly warmer water than fine cotton, but high heat in the dryer will still cause shrinkage and reduce the plushness of the pile over time.
Nightgowns: Delicate cuts and fine fabrics make nightgowns worth treating with extra care. Use a mesh laundry bag to protect the garment from abrasion during the wash cycle, and opt for air drying over the dryer if possible.
Sleep masks: Hand wash or place in a mesh bag on a delicate cycle. Keep sleep masks out of the dryer entirely. Even a brief tumble can distort the shape and compress the padding.
Monogrammed items: Wash monogrammed designs (link to monogram article) inside out to protect embroidery from friction. Avoid high heat, which can cause thread to contract and pucker the surrounding fabric. Air dry or tumble dry on the lowest possible setting.

Frequently Asked Questions

Can you put pajamas in the dryer?

Yes, with caveats. Most cotton pajamas can be tumble dried on low heat. High heat is the primary cause of shrinkage and fabric wear. Always check the care label, and remove pajamas while slightly damp to preserve shape. Silk should never go in the dryer.

Why do pajamas shrink in the wash?

Pajamas shrink primarily due to heat, both from hot water and the dryer. Natural fibers like cotton contract when exposed to high temperatures. Washing in cold water and drying on low heat or air-drying eliminates the main shrinkage risk.

How do you unshrink pajamas that have already shrunk?

To relax shrunken cotton fibers, soak the garment in lukewarm water mixed with a small amount of hair conditioner or baby shampoo for 20 to 30 minutes, then gently stretch it back to its original shape and lay flat to dry. Results vary based on the fabric and the degree of shrinkage, but this method often works well for mild cases.

How do you wash silk pajamas at home?

Hand wash silk pajamas in cool water with a pH-neutral or silk-specific detergent. Gently swish, and do not wring or scrub. Press between clean towels to remove excess water and lay flat to air dry away from direct sunlight. Never put silk in the dryer.

Can you wash pajamas with other clothes?

Yes, but it’s best to wash pajamas with similarly delicate items. Avoid washing with rough fabrics like denim and towels, or anything with zippers and Velcro, which can cause snags, pilling, and abrasion damage over time.

How often should you wash pajamas?

Adults should wash pajamas every two to three wears. Children’s pajamas — especially styles for babies and toddlers — should be washed after each wear. Silk pajamas benefit from less frequent washing, so air them out between wears when possible.

What laundry detergent is best for pajamas?

A mild, fragrance-free liquid detergent is ideal for most sleepwear. For silk pajamas, use a pH-neutral formula designed for delicates. Avoid powder detergents, bleach, and detergents with added brighteners on colored or printed fabrics.

Should I use fabric softener on pajamas?

Generally, no — especially for children’s sleepwear. Fabric softener can reduce the effectiveness of flame-retardant fibers in kids’ pajamas and leave a residue that dulls fabric over time. High-quality Pima cotton is naturally soft and doesn't benefit from it.

Summary

Great pajamas — the kind that soften beautifully over time and hold their shape year after year — are meant to be enjoyed. They’re designed to be lived in, slept in, and loved. But like any fine garment, they reward a little intention. Cold water, a gentle wash cycle, and low heat or air-drying are often ideal.

Over time, these small acts of maintenance become part of the larger ritual of resting well. Take good care with both.