Size Guide

Newborns outgrow things at a pace nobody warns you about, and sleepwear is the one place where a bad fit matters most. This guide walks you through the three lengths the LIOR Held Swaddle Sack comes in, how to read them against your own baby, and how to tell when it is time to move up. Getting this right takes two minutes and saves you a return.

Size chart

Our sacks are sized by the length of the garment in centimetres. The age ranges beside each length are a starting point from our supplier, not a rule — babies of the same age are often two sizes apart.

We do not publish weight bands for this sack yet. We would rather tell you that than print a number we cannot stand behind. Until our factory confirms them, use length and age together, and follow the fit checks below.

Sizing for the newborn stage

The LIOR Held Swaddle Sack is a stage-one sack: one piece, one zip, arms inside two closed wing pockets. It is made for the months before your baby starts trying to roll.

A sack that is too big is the one to avoid. Loose fabric around the shoulders and chest is the reason we ask you to size down rather than up when your baby sits between two lengths. Aim for the smallest size your baby still fits into comfortably, and move up when they genuinely need the room.

If your baby was born early or has a condition that affects how they sleep, talk to your own health professional before you use any sleepwear.

How to get the right fit

• Measure, don't guess. Lay your baby down and measure heel to shoulder. Pick the length that clears that measurement with a little room at the feet, not a lot.
• Check the neck. Zipped up, the collar should sit close enough that your baby cannot slip a shoulder or a head through it, without pressing on the throat.
• Check the wings. Arms should sit inside the pockets without being pushed against the chest. Hands stay covered.
• Leave a little growing room, not a lot. Extra fabric in a sleep sack is not a bargain, it is a hazard.
• Watch the shoulders. When the shoulder seam is pulling, the next length is due.

When to size up, and when to stop

Move up a length when the shoulder seam starts to pull or your baby's feet reach the hem — usually before the age range says so. Stop using an arms-in sack altogether at the first signs your baby is trying to roll, whichever happens first. That is not a size question, it is a hard stop.

Still unsure between two lengths? Email support@lior.store with your baby's age and heel-to-shoulder measurement and we will tell you which one to order.