Sleeping Bag 6-18 Months - OCS - Capri: Sizing, TOG, and What to Check

Quick answer

Choose a 6-18 month sleeping bag when your baby has outgrown the 0-6 month length and can no longer push their arms out of the neck opening. Match the TOG rating to your nursery temperature, then check that the neck fits snugly, the armholes sit on the shoulders, and the bag leaves room to kick without riding up over the face.

A sleeping bag only works if it fits. Too long and your baby can slip down inside it; too tight and they fight it all night. The 6-18 month size is the middle stage, and it is where most parents start asking about TOG ratings, organic certifications, and whether the bag will still fit next season.

This guide walks through the sizing signals, the TOG decision, and the details worth checking before you buy. It uses the Cam Cam Copenhagen range as a reference point because the brand publishes certification and material facts clearly, which makes the trade-offs easier to see.

When to move to a 6-18 month sleeping bag

The move is driven by length and mobility, not by age alone. If your baby's feet press against the bottom of the 0-6 month bag, or if the neck opening has become loose enough that they can pull an arm through, it is time to size up. A bag that is too small restricts leg movement; one that is too large lets a small baby slide down inside the fabric.

A 6-18 month bag is cut longer through the body and usually has a slightly wider chest. That extra length is useful for babies who are rolling, sitting, and starting to pull up. Check the manufacturer's height range rather than assuming the label matches your baby's age, because two babies of the same age can differ by several centimeters.

• Feet touching the bottom seam: size up.
• Arm can slip through the neck opening: size up.
• Bag rides up over the chin during sleep: check the neck and shoulder fit.
• Baby still fits with 5-8 cm of length to spare: stay in the current size.

How to read a TOG rating for a 6-18 month bag

TOG measures thermal insulation, not warmth on its own. A 1.0 TOG bag suits warmer rooms, around 20-24°C, while a 2.5 TOG bag is for cooler rooms, roughly 16-20°C. The number only helps if you know your nursery temperature, so measure it at cot height rather than relying on a wall thermostat in another room.

Layer underneath the bag, not over it. A cotton bodysuit plus a 2.5 TOG bag is often enough for a 17°C room. Adding a blanket over a sleeping bag defeats the purpose and creates a loose layer. If you are unsure, start with the lower TOG and add a layer of sleepwear, because overheating is harder to reverse than a slightly cool baby.

• Measure room temperature at cot height, away from radiators and windows.
• Choose one TOG per season, not per night, and adjust the under-layer instead.
• Never add a loose blanket on top of a sleeping bag.

What OCS certification means on a sleeping bag

OCS, the Organic Content Standard, verifies the organic content of a textile and tracks it from source to finished product. It is not the same as GOTS, which covers organic fiber plus stricter social and environmental criteria across the whole supply chain. An OCS certified sleeping bag tells you the organic cotton content is verified; it does not automatically mean the dyeing or finishing meets GOTS-level rules.

That distinction matters if you are comparing two bags at similar prices. If organic fiber content is your main concern, OCS is a reasonable baseline. If you also want restrictions on processing chemicals and wastewater, look for GOTS. Both are third-party verified, so neither is a marketing-only claim.

• OCS: verifies organic content and chain of custody.
• GOTS: organic fiber plus processing and social criteria.
• Check the label for the certification body, not just the logo.

Fit checks before you buy

Neck opening is the first check. It should sit close to the neck without pressing on the throat. If you can fit more than two fingers between the neck and the fabric, the bag is too loose for a baby who is not yet walking. Armholes should sit at the shoulder joint, not halfway down the upper arm, so the arms can move freely without the bag twisting.

Length is the second check. Lay the bag flat and measure from the neck seam to the bottom. Compare that to your baby's height plus 10-15 cm of kicking room. A bag that is 20 cm too long will bunch under the feet and can trip a toddler who is learning to stand. If your baby is between sizes, choose the smaller size and plan to replace it sooner.

• Neck: snug, no more than two fingers of slack.
• Armholes: at the shoulder, not mid-arm.
• Length: baby's height plus 10-15 cm.
• Zip: should run smoothly and have a fabric guard at the chin.

Materials and care that affect how long the bag lasts

Sateen-weave cotton feels smooth and drapes well, but it is not the same as a stretchy jersey. A woven sleeping bag holds its shape and is less likely to twist around the legs, which is useful for active sleepers. The trade-off is less give at the shoulders, so the fit at the neck and armholes matters more.

Wash the bag according to the care label, usually 40°C or lower, and avoid fabric softener because it coats the fibers and reduces breathability. A sleeping bag worn every night should be washed weekly, or more often if your baby drools or spits up. Buy a second bag if you can, so one can be in the wash without disrupting the routine.

• Sateen cotton: smooth, holds shape, less stretch.
• Wash at 40°C or lower; skip fabric softener.
• A spare bag keeps the sleep routine intact on wash day.

Decision rules for buying a 6-18 month sleeping bag

• If your baby's feet touch the bottom seam: Move to the 6-18 month size now. A bag that is too short restricts leg movement and can wake a baby who is trying to roll or kick. Size up as soon as the feet reach the seam, not when the label age is reached.
• If your nursery sits at 16-20°C: Choose a 2.5 TOG bag and a cotton bodysuit underneath. If the room regularly exceeds 20°C, drop to a 1.0 TOG bag rather than removing the under-layer. Match TOG to the measured room temperature, not to the season name.
• If organic fiber content is your priority: An OCS certified sleeping bag verifies the organic content and chain of custody. If you also want processing and social criteria covered, look for GOTS instead. OCS is a solid baseline; GOTS goes further on processing.
• If your baby is between sizes: Choose the smaller size and accept a shorter useful life. An oversized bag bunches under the feet and can ride up over the face during sleep. Fit beats longevity for safety.
• If you only want to buy one bag: Pick the TOG that matches your most common room temperature and adjust the under-layer with the seasons. One well-fitted bag used correctly outperforms two poorly matched ones. Buy for your average night, layer for the extremes.

Cam Cam Copenhagen options that fit this stage

• Baby Nest - OCS - Dreamland: The Baby Nest has a firm and stable bottom, and the inner edge is designed with a 90-degree angle to ensure maximum breathability and safety. It complies with BS4578 for hardness and air flow, and is resistant to ignition as per BS5852. Useful for supervised daytime rest and as a familiar sleep cue before the move to a full sleeping bag, but it is not a replacement for a cot sleeping bag at night.
• Bedding, Junior, 100x140cm - GOTS - Capri: Soft organic, GOTS-certified bedding in sateen-weave cotton, including a duvet cover 100x140cm and a pillow case 40x45cm, both closed with a YKK zipper. If you are already using the Capri print in the nursery, matching the bedding keeps the cot visually calm and confirms the same sateen cotton quality you would expect from a Capri sleeping bag.
• Activity Cube - OCS - Sea Garden: Each side features multi-sensory play options, fun crinkle textures, squeaker, pull tabs, mirror, and a small jingle bell. A practical pre-sleep wind-down toy for the 6-18 month stage, when babies need a quiet activity before the sleeping bag goes on.
• Tummy Time Mirror - OCS Dreamland: The mirror has fun crinkle textures and a squeaker that can stimulate fine motor skills when babies are able to reach and grasp the mirror. Supports daytime tummy time, which builds the back and neck strength babies use to roll and reposition themselves in a sleeping bag.

Who the 6-18 month sleeping bag suits

Best for

• Babies who have outgrown the 0-6 month length and can no longer slip an arm through the neck opening.
• Parents who want a verified organic-content option and are comparing OCS with GOTS.
• Nurseries where the temperature is measured and a single TOG can cover most nights.

Not for

• Newborns who still fit a 0-6 month bag with room to spare.
• Babies who need a swaddle or arms-down transition, which a standard sleeping bag does not provide.
• Parents looking for a bag with a specific TOG that is not published for the product they are considering.

Buy the size that fits today, the TOG that matches your measured room temperature, and the certification level that answers your main concern. Check the neck, armholes, and length before the first night, and keep a spare bag so wash day does not undo a routine that is finally working.