Is this blanket big enough for swaddling a newborn?

It measures 48" x 48", a standard square size for swaddle wraps. That is roomy for newborns and young infants; bigger babies outgrow a square wrap sooner.

Is muslin warm enough for sleep?

Muslin is a lightweight, breathable open weave, so it suits warm rooms and layered wrapping. In a cold room it is thinner than a quilted or fleece swaddle.

Does it have a closure or Velcro?

No. It is a flat square blanket with a pompom edge, so you fold and tuck it yourself. Parents who want a fixed fit usually choose a Velcro or zip swaddle pod instead.

Are the pompoms safe around a baby?

The pompoms are a decorative trim along the edge, not a fastening. Check them for loose threads and keep the trimmed edge away from the face when wrapping.

How should I wash it?

Cotton muslin is machine washable and gets softer with each wash. Wash with like colors, since the light pink and white print can bleed, and check the pompoms after washing.