Alvi Blue & White Striped Baby-Mäxchen Outer Sleep Sack (68-74 / 6-9M)

The Alvi Baby-Mäxchen is Germany's most trusted baby sleep sack system, developed with midwives and hospital-tested. This outer bag in soft blue and white stripes features the signature pear shape for freedom of movement, with button-adjustable shoulder straps. Made from breathable cotton jersey, it provides safe, blanket-free sleep. Part of the two-piece system — ideal for cooler nights.

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Blueberry offers premium second-hand children's clothing you can trust. Every piece is hand-selected from brands like Petit Bateau, Jacadi, Bonpoint, and Ralph Lauren—at up to 80% off retail prices. We offer fast shipping, easy returns, and clothing in excellent condition, ready for its next adventure.

Have clothes to sell? Through our Sellback Program, we buy premium children's clothing in gently-used condition. It's a quick and easy way to clear out outgrown pieces, earn cash or store credit, and keep beautiful clothes in circulation -- no listings, no hassle.