Quick answer

Choose the Butterflies Flying Squirrel Pajama for toddlers 12 months and up who need freedom to move, and the Zipadee-Zip for babies 3 months and older who are transitioning out of a swaddle but still want cozy security.

Age and mobility differences matter most

The two sleep sacks serve different stages of your child's development. The Flying Squirrel Pajama is designed for little ones from 12 months to 5 years, giving older toddlers and preschoolers plenty of room to grow. The Zipadee-Zip fits babies from 3 months to 3 years, covering the critical transition period when babies start to wiggle and roll.

If your baby is under 12 months, the Zipadee-Zip is the only safe choice between these two. If your child is over 3 years, the Flying Squirrel Pajama is the better fit. For the overlapping 12-month to 3-year range, your decision should hinge on your child's sleep style.

Movement versus security: the core trade-off

The Flying Squirrel Pajama acts as a wearable blanket, so it moves with your child no matter how much they toss and turn. Its loose fit and ribbed cuffs at wrists and ankles keep the fabric in place without restricting movement. This makes it ideal for active sleepers who roll, kick, and change positions throughout the night.

The Zipadee-Zip uses a starfish design that provides the cozy, secure feeling of a swaddle while still allowing a range of motion. It's a safer alternative once your baby starts to wiggle and roll, but the wings can feel confining for a child who prefers complete freedom. If your toddler is a wild sleeper, the Flying Squirrel Pajama's open design will likely be more comfortable.

Both follow AAP safe sleep recommendations

Both sleep sacks are designed based on safe sleep recommendations from the American Academy of Pediatrics (AAP). That means you don't have to compromise on safety when choosing between them. The key is matching the product to your child's age and developmental stage, not just their sleep style.

Which should you pick?

  • If your baby is 3–12 months: Choose the Zipadee-Zip. It's the only option suitable for this age range and provides the secure feeling babies need as they start to roll. Check your baby's current age against the size chart before ordering.
  • If your toddler is 12 months–3 years and a light or active sleeper: Choose the Flying Squirrel Pajama if they move a lot. Its wearable blanket design gives them full freedom while staying covered. Choose the Zipadee-Zip if they still crave the snug feel of a swaddle. Observe your child's sleep position for a few nights to see if they prefer open space or gentle compression.
  • If your child is 3–5 years: Choose the Flying Squirrel Pajama. The Zipadee-Zip's upper age limit is 3 years, so this is the only fitting option for older preschoolers. Measure your child's height and weight against the product's size range to ensure a good fit.

Product facts at a glance

Who each sleep sack fits best

Best for

  • Babies 3–12 months transitioning out of a swaddle who need gentle security
  • Toddlers up to 3 years who still like a snug, cozy feeling while sleeping

Not for

  • Children over 3 years (choose the Flying Squirrel Pajama instead)
  • Toddlers who strongly prefer unrestricted movement (choose the Flying Squirrel Pajama instead)