Just when you thought you had the baby burrito mastered, the swaddle unravels — once and for all.

Good-bye, wrap. Hello, sleep sack.

Make the transition to swaddle-free sleeping as easy as Sunday morning (before kids) with the latest from Aden + Anais. The beloved swaddle maker fashioned its famous cotton muslin into crib sheets.

Just like the company’s all-purpose blankets, the muslin bedding gets softer every time it’s washed. Elastic edging makes for a secure fit over the mattress, and a wide weave allows air to circulate, helping regulate baby’s temperature and keep him safe.

The sheets come in soft, solid colors (gray, pink, blue) and delicate patterns (owls, stars, dogs) that lull even the youngest resters into a deep sleep.

Just like a burrito but without the indigestion.

Available online at adenandanais.com, $30-$40.

Photo: Courtesy of Aden + Anais

BLOOM
Sendak in Spring
What: Check out the interactive Wild Things Whirligig, make a 3-D book, and listen to stories.
Why: Get ready to rumpus.
When: Sat. & Sun., noon-4 p.m.; performances, 1 & 3 p.m.
Where: The Rosenbach Museum & Library, 2008-2010 Delancey Pl. (215-732-1600). To register for the performance, stop by the museum prior to the show. Adults, $10; children, $5; under 5, free.

FEAST
Waffle Day
What: Help yourself to lingonberry juice and jam-topped waffles in honor of the Swedish holiday.
Why: Sounds a touch more tempting than soggy cereal.
When: Sun., 11 a.m.-3 p.m.
Where: American Swedish Historical Museum, 1900 Pattison Ave. (215-389-1776). Cost is $10.

CELEBRATE
Bicentennial Weekend
What: The Academy of Natural Sciences of Drexel University marks its 200th anniversary with crafts, birthday cake, and a barbershop quartet.
Why: Push back bedtime for the multimedia light show running every half hour between 7:30 and 10:30 p.m.
When: Sat. & Sun., 10 a.m.-9 p.m.
Where: 1900 Benjamin Franklin Pkwy. (215-299-1000). Adults and teens, $12; children, $10; under 3, free.