Muslin or cotton interlock? Choose by the month your baby is due

"Which one should I get, muslin or interlock?" We are asked this several times a day. The short answer: look at your due date.

What muslin is, and why four layers

Muslin is a loosely woven cotton. A single layer is very thin, which is why we use four. Four-layer muslin does two things well: it drapes with some substance, and it softens with every wash.

When it first arrives it can feel slightly crisp. After three or four washes it is a different fabric in your hands. That is not the fabric wearing out — that is the fabric arriving.

We do not make two-layer muslin. We tried; it simply did not cover well enough.

Muslin's real strength is airflow. On a hot afternoon, a baby wrapped in muslin does not sit in trapped heat. For summer babies it is our first recommendation.

When interlock is the better choice

Cotton interlock is a denser knit. It sits closer to the body and holds warmth better. For babies due between November and February, we suggest interlock.

Worth saying plainly: interlock is not outerwear. It is a warmer base fabric, not a coat. On a genuinely cold day it needs a layer over it.

And the in-between months?

For March, April, September and October, either works. In that case, look at the house rather than the calendar. A warm, centrally heated home suits muslin even in cooler months. A cool or damp home makes interlock the kinder choice — the baby will spend those first weeks at home, not outdoors.

You can also mix. Some parents choose an interlock blanket with a muslin romper. You do not have to take a set as it is: pick the pieces you want and we will build it around you.

Our other fabrics

Poplin is a tighter weave with a smooth surface. We use it mostly for bedding and pillow groups.

Waffle piqué has the honeycomb texture its name suggests — light but with volume, which works well for coverlets.

Cotton sateen appears from time to time, usually when someone wants the pillow, blanket and stroller cover as a matching group.

Care, in one line

Wash cool, wash inside out, skip the fabric softener. Muslin softens on its own, and softener actually reduces absorbency — which you notice on bibs and burp cloths.

Three questions that settle it

First: which month is the baby due? June to September, muslin. November to February, interlock. Everything else is the in-between case above.

Second: how warm is the house? The baby will spend those first weeks indoors, so your heating matters more than the weather report.

Third: is this mainly for the coming-home photographs, or for months of wear? If it is mostly the photograph, appearance leads. If it will be worn and washed constantly, durability leads — and there muslin has the edge, because washing improves it rather than wearing it out.

Common questions

*"Does muslin make a baby too warm?"* The opposite. Its strength is airflow; heat does not get trapped. Overheating is usually a synthetic-fabric problem.

*"Can interlock work in summer?"* Not in real heat. But on a cool summer evening, or in an air-conditioned room, an interlock romper is very comfortable.

*"How many washes will it take?"* This matters more than people expect, because newborn laundry is relentless. Muslin holds up well — it does not degrade, it softens.

Still unsure?

Tell us the month you are due and we will tell you which one we would choose. We are not guessing: we have watched both fabrics through a lot of first weeks.