How to Use a Side Zip Sleeping Bag for Easier Night Nappy Changes
By ergoPouch: Sleeping Bags, Swaddles & Sleepwear for Babies ... | Published: 2026-10-16
Category: How-to Guides
A side zip sleeping bag lets you change a nappy at night without fully unzipping the bag. Here is the step-by-step method, plus what to check before you buy.
Quick answer
Put your baby in the sleeping bag as usual, then at nappy time lay them down, unzip only the side zip from the bottom, and fold the front panel back just enough to reach the nappy. Keep the room dim, keep the top of the bag on, and rezip the side zip fully before you leave. Check the side zip runs smoothly and the bag fits the shoulders before you rely on it at 3am.
What a side zip changes about night changes
A side zip sleeping bag opens down one side rather than down the centre front. That means you can reach the nappy area without opening the chest and shoulders, so your baby keeps more of the bag's warmth and stays closer to sleep. It is a small design difference, but at 2am it is the difference between a five-minute change and a full wake-up.
The trade-off is real: side zip bags can be slightly fiddlier to get on a wriggling baby in the first place, because you are threading arms and legs through a bag that opens to one side. If your baby is a calm dresser, you will barely notice. If they fight every change, practise the side zip in daylight before you depend on it overnight.
Before the change: set up so you only touch the zip once
Have the new nappy, wipes and a bag for the old nappy within arm's reach before you unzip anything. A side zip sleeping bag is designed to limit how much you disturb your baby, and that only works if you are not walking to the changing table mid-change.
Keep the room dim and avoid turning on a bright overhead light. If you need light, use a low, warm-toned night light so your baby does not fully wake.
Choosing a side zip bag: what actually matters
Look at the zip pull first. A side zip is only easier if the pull is easy to grip and the zip does not catch on fabric. On a premium sleeping bag side zip, the zip should run cleanly along the side seam without snagging.
Second, check the TOG and the fit. A bag that is too long can ride up over the face, and a bag that is too tight at the shoulders makes the side opening awkward to fold back. Match the TOG to the room, not to the season name on the label, and size to your baby's height and weight rather than age alone.
Third, decide whether you need side zip at all. A front zip bag is usually faster to put on and take off, and many parents prefer it for daytime. Side zip earns its place specifically for night nappy changes and for babies who sleep better with less disturbance.
Night nappy change: step by step
- 1. Lay your baby down and check the room: Place your baby on their back on the mattress or a safe flat surface. Keep the light dim and the room at the temperature you normally use for sleep. Common mistake: turning on a bright light. It wakes your baby more than the change itself.
- 2. Unzip only the side zip: Open the side zip from the bottom upwards, stopping before the chest and shoulders. Do not unzip the whole bag. Checkpoint: the zip should glide without catching. If it snags, stop and check the fabric is not trapped in the teeth.
- 3. Fold the front panel back just enough: Peel the front of the bag back only as far as you need to reach the nappy. Keep the top half of the bag over your baby's chest and arms. Common mistake: folding the bag right open. That defeats the point of a side zip and lets cold air in.
- 4. Change the nappy and reseal the old one: Change the nappy, wipe as needed, and put the used nappy straight into a bag or bin within reach. Fasten the new nappy before you touch the sleeping bag again. Checkpoint: no cream or powder on the bag fabric. It can affect the zip and the fabric over time.
- 5. Rezip the side zip fully: Fold the front panel back into place and close the side zip all the way to the top. Run your finger along the zip line to confirm nothing is caught. Common mistake: leaving the zip partly open. A gap lets cold air in and can let your baby's leg slip out.
- 6. Settle your baby back down: Keep the room dim, avoid picking your baby up if they are calm, and give them a moment to resettle in the bag. If your baby is already upset, a brief cuddle is fine, then return them to the bag before they fall fully asleep.
Product facts that matter for this method
- Side Zip Premium Sleeping Bag 0.3 TOG Daisies: Designed for confident tummy sleepers, this premium sleeping bag gives your little one freedom to move while staying safely warm all night. If your baby rolls onto their tummy, a bag that allows movement matters more than a snug fit, and the side zip keeps the change quick so you disturb that position less.
- Premium Sleeping Bag 1.0 TOG: This premium sleeping bag offers a silky-smooth, wider fit for infants aged 8 months and older who are ready to sleep with arms out, with a 1.0 TOG rating for everyday sleep. A wider fit makes the side opening easier to fold back without pulling at the shoulders, which is exactly what you want during a night change.
- Summer Sleeping Bag Pack: The Summer Sleeping Bag Pack includes one 0.2 TOG sleeping bag and one 1.0 TOG sleeping bag, and the sleeping bag is recommended as baby's first sleeping bag after the swaddling phase. Two TOG weights let you keep the same night-change routine as the room warms or cools, instead of relearning a different bag.
