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  • Sizing and Fit

    • Size





      3-6 months

      up to 28 inches



      6-12 months

      up to 32 inches



      12-24 months

      up to 39 inches


      *size chart
      NOTE: Zipadee-Zip ideal fit has slight resistance in the arm span because this is helpful when transitioning a baby off of the swaddle.


      The small is geared towards the 12-19 or 20 pound mark and is designed for babies up to 6 months old, or up to 28 inches tall. Some little ones use the small until 22lbs. The length of the zipper alone on all the Zipadee-Zips is 24 inches (remember that a baby’s head makes up a good portion of their height so the small will fit most little ones under that 6 month mark with no problem.

      If a caregiver is using the Zippy as a SWADDLE TRANSITION and their little one is around 17-18 lbs and is under 6 months old, I really recommend getting the Small for the transition. I recommend the smaller fit to start because there is more resistance in that wing-span which gives the baby more of a feeling of being enclosed and cozy. This womb-like sensation is what helps ease the transition off of the swaddle.

      Under 6 months old, a baby’s startle reflex will still be coming into play and the Zipadee-Zip is most effective if there’s slight resistance in the arm-span of the fit so a baby has to push on the fabric a little to extend fully. That slight resistance is what gives a little one the sense of enclosure they need to soothe the startle, and feel nice and cozy during the transition off of the swaddle. Some caregivers who have never swaddled their little ones will use the Zipadee-Zip to transition a baby from sleeping in a swing or a Rock and Play sleeper to a crib and a snugger fit is encouraged for that transition as well.

      If your baby weighs above 18 pounds and is around 28 inches tall, they are on the cusp of moving to a Medium and may not be in the Small for very long (although my daughter wore her small until she was over 22lbs) which is why parents will usually get a Small for an easier transition and a Medium for once the baby is comfortable with the new-found freedom. If you decide to go with a size Medium so that your little one can grow into it, make sure to do nap times in the Zipadee-Zip first for a while before moving to night time sleep. That will help ease your little one into the freedom over a shorter period of time. Ideally you want to have resistance in the arm span if you are transitioning from the swaddle.

      If, a caregiver is only using the Zippy as an alternative to PJ’s, to keep a baby’s hands warm or to prevent scratching (for babies with eczema for example), there’s no harm in a little extra room. If a baby is on the cusp of moving to a size medium and doesn’t need any help with a transition, going to a larger size is fine.

      If your baby is over 6 months old AND over 18lbs, or over 28 inches tall, go with the medium. Past 6 months old, the startle reflex has started to subside so it’s easier to make the transition off of the swaddle in a slightly larger size as long as your baby is 18 lbs or over. If your baby is right on the 18lbs mark, and you don’t want to go with the small after reading the information above, a more gradual transition might be helpful if you do decide to go with the medium since there will still be room to grow in that size and there will be less resistance in the arm-span to help with soothing. In the event that your little one is right on cusp of moving between sizes it may help to do naps for a while before night time sleep just so that your little one has more time to get used to the new-found freedom. Most babies wear the Medium until 12 months old or older. The medium fits babies up to 32 inches tall.

      As I stated before, if the Zipadee-Zip is not being used as a transition solution or is not being used to help improve sleep or self-soothing skills, the resistance in the arm-span is not as important and more freedom in the fit will be just fine!

      This size is NOT meant for the transition off of the swaddle but after a baby has already made that transition with a smaller size. I also do not recommend skipping the size Medium and going from the Small to the Large. There is a reason behind how the Zipadee-Zips are sized as it provides a gradual transition to full freedom making the move to PJ’s instantaneous and easy! The size Large is very big and can fit most 2.5 year olds. The difference between a size Medium and a size Large is pretty significant. The Large gives a baby lots of extra room with no resistance at all. This is the size you want to move to after the transition and before your little one sleeps freely in normal PJ’s. I highly recommend using the Large for a while before moving to PJ’s. It will still give them the security of being enclosed and cozy but will allow them to get used to moving around completely unrestricted. This size is also a perfect alternative for parents who haven’t swaddled and just want to put their little ones in a wearable blanket that keeps those little hands warm at night and prevents scratching. Parents who have never swaddled or even never used the Zipadee-Zip in smaller sizes will often get the Zipadee-Zip in a Large as a solution to keep their wiggly little toddler from climbing out of the crib. It also has helped a lot of parents make the transition from crib to toddler bed much easier as it encourages little ones to stay in their bed. The large fits babies up to 39 inches tall.


    • Size





      1-3 years

      up to 39 inches



      3-6 years

      up to 48 inches



      6-10 years

      up to 56 inches


      NOTE: Flying Squirrel sizing runs large. Sizing/fit is adjustable to maximize growing room.


      SIZE 12-24 MONTHS:
      Our Flying Squirrel PJ was created out of an expressed need from our customers for a next step up from the Zipadee-Zip. It has optional hand and foot coverings which make it ideal for little ones who kick their blankets off. The Flying Squirrel is NOT intended to replace the large Zipadee-Zip (we recommend going to the large Zippy before moving to PJs), however the 12-24m size Flying Squirrel is comparable in length to the size large Zipadee-Zip. The reason we recommend going to the Large Zipadee-Zip after the Medium Zipadee-Zip and not straight to the Flying Squirrel from a Medium Zippy is because the Large Zippy still provides a little one with that fully enclosed feeling while still being loose enough to prepare a little one for that move to PJ’s. We strategically size the Zipadee-Zips so that moving to PJ’s at around 18-24 months is super easy! The 12-24 Month/2T Flying Squirrel size is more geared towards the upper end of that age range but because of the way they fit (the bagginess in the arms and legs can moderate the fit (lengthened or shortened) by the wrist and ankle cuffs so they are also perfect for younger toddlers as well.

      SIZE 2/3T:
      This size fits a toddler that wears from 3T up to size 6 in children's clothes. That’s what is so great about the flying squirrel… the bagginess in the fit allows a toddler to wear them for a long time and be able to pull the ankle cuffs down to convert them to socks! The wrist cuffs can also turn into mittens as well! If your child has outgrown the size Large Zipadee-Zip, the 2/3T Flying Squirrel is the next step up in sizing. 

      SIZE 4/5T:
      This fits a child that wears from size 6 up to a 9/10 in children's clothes. They are generously sized so they can be adjusted to cover the hands and feet if desired.

    • A baby can actually use the size large until they are upwards of 2-2.5 years old.  This is right around the time when a toddler transitions from the crib to a bed. Most caregivers move their little ones out of the Zippy close to the 2 year mark. The Large Zipadee-Zip is intended to be the last step a baby takes before they go to PJ’s.  There is no transition between sizes but the Large is what equips them to get used to full freedom of movement so they are able to move to PJ’s with no problems or transition whatsoever! 

      There is no need to rush and there’s no harm at all in using it longer (if anything, it makes the move to PJ’s easier the older they are).  Once your little one has been in the size large for a while, we have a great graduate product called the Flying Squirrel PJ that goes up to size 5T and has optional hand and foot coverings! 

      We’d love to hear your stories about your little Zippy graduates! Share them here!


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  • Sizing Charts

    Zipadee Zip

    Small 3-6 months 24-28 inches ~12-19lbs
    Medium 6-12 months 29-32 inches ~19-26lbs
    Large 12-24 months 33-40 inches ~26-34lbs

    Flying Squirrel PJs

    12-24m 1-3 years up to 39 inches ~26-34lbs
    2/3T 3-6 years up to 48 inches ~34-49lbs
    4/5T 6-10 years up to 56 inches ~49-87lbs