Moving from bassinet to cot: when and how to make the transition smooth

Sleep · Updated July 2026 · All articles

The bassinet has been your baby's first sleeping space, and the move to a full-size cot is one of those transitions that many parents approach with a mix of practicality and mild dread. Will they sleep as well? Will the new space feel too big? Do you have to move them to a separate room at the same time? This article covers the safety signals that tell you when to move, how to help your baby settle in the new space, and which approaches tend to make the transition easier.

When to move: weight, length limits, and developmental signals

Every bassinet has a maximum weight limit stated by the manufacturer, and that limit is the clearest safety signal to act on. Most bassinets specify a limit of around 9 kg (20 lbs), though some models are lower, particularly travel or rocking bassinets. Check your specific model rather than relying on a general figure. Length limits are less commonly specified but are equally important in practice: if your baby's head or feet are touching the ends, they have outgrown the space.

Beyond weight and length, developmental milestones are the other key trigger. Any bassinet that can be tipped or destabilised becomes a safety risk once a baby can roll or push up on their hands and knees. More critically, a baby who can pull to sitting or sit unassisted in the bassinet can potentially tip it over. You should make the move before these milestones arrive, not after. Watching for signs of rolling or pushing up gives you a useful early-warning window.

In practical terms, most families make the move somewhere between 3 and 6 months. Some babies are large and reach weight or length limits earlier; smaller babies or those born early may stay comfortable in the bassinet toward the later end of that range. There is no single right month. The question to answer is: are the safety criteria still met?

Why you should move before they can sit unassisted

It is worth dwelling on this point specifically, because many parents wait until a sleep problem appears before making the move, which can mean waiting too long from a safety perspective. A bassinet is designed for a baby with limited motor capability. The mesh or fabric sides, the weight of the structure, and the height of the sleep surface are all calibrated for a baby who lies still or wiggles at most.

A baby who can sit up or pull to stand changes the physics entirely. The centre of gravity shifts when they move upright, and many bassinets will tip at this point. This is not a theoretical concern; it is the specific reason manufacturers set developmental limits. The transition to a cot should be completed before your baby reaches sitting milestones, ideally with a comfortable margin.

NHS room-sharing guidance: cot in your room first

A common misconception is that moving from bassinet to cot automatically means moving the baby to their own room. It does not, and the guidance says otherwise. The NHS, following Lullaby Trust recommendations, advises room-sharing for at least the first six months and ideally through the full first year. Room-sharing (the baby sleeping in the same room as you, but in their own separate sleep space) is associated with a reduced risk of SIDS.

The practical implication is that the first step is usually a full-size cot in your bedroom, not in a nursery. Many parents find this achievable by rearranging the room, moving a wardrobe, or temporarily losing access to a bedside table. If the room genuinely cannot accommodate a standard cot, a bedside cot (which attaches to the side of your bed) or a large travel cot next to your bed are both used by families in this situation.

Moving to a separate room is a separate decision that can be made when the family is ready, after the first six months at the earliest. Decoupling the two transitions (bassinet to cot, and same room to separate room) makes each one more manageable.

Making the cot feel smaller and less overwhelming

One of the most consistent observations from parents is that babies who have spent weeks in a bassinet with close walls can seem unsettled in the open expanse of a full cot. There are a few practical approaches that help. Placing a rolled towel or pool noodle under the mattress cover at each side of the sleeping area can create a gentle slope that gives a subtle sense of enclosure. This goes under the mattress cover, never loose inside the cot where it could pose a suffocation or entrapment risk.

The choice of sleep sack matters here too. If your baby has been swaddled and is transitioning to arms-free sleep at the same time as moving to the cot, the two changes at once can compound the adjustment. If possible, separate these transitions: move to the cot first while keeping the same swaddle approach, then transition out of swaddling once the cot feels familiar. If your baby is already swaddle-free, a well-fitting sleep sack with appropriate TOG for the room temperature gives a light feeling of being held without adding any loose fabric.

The scent transfer technique

Smell is one of the most powerful senses for young babies, and a scent-transfer approach is simple, free, and genuinely useful. The basic technique is to sleep with the cot sheet for one or two nights before you put it on the mattress. The sheet absorbs your scent, and when your baby encounters it in the cot, they register the smell of you in their sleep environment. This is the same principle behind the advice to tuck a piece of worn clothing into the bassinet; it is just applied to the new space.

The same logic applies to a new sleep sack. If you can wear it against your skin for a few hours before putting your baby into it for the first time, it will carry your scent rather than the smell of packaging. Keep in mind that the clothing or items with your scent should never be placed loose inside the cot where they could be pulled over a baby's face. The scent transfer is about the fitted sheet and the sleep sack itself, not about additional loose items.

Gradual vs cold turkey: which to try

Both approaches have their advocates and both can work, depending on the baby's age and temperament. A gradual approach means introducing the cot during daytime naps while keeping nights in the bassinet. You might start with one nap per day in the cot, then two, then all naps, and then move nights across once the baby has spent several sessions sleeping comfortably in the new space. The cot becomes associated with sleep before it is the only option at 2am.

A cold turkey switch means moving fully to the cot for all sleep on the same day. This sometimes works very smoothly, particularly with younger babies under 4 months who are more neurologically flexible and less habituated to specific environments. It can also be the better practical option if the bassinet is needed elsewhere (for a sibling, or because it needs to be returned).

For babies who have had several months in the bassinet and are more aware of their environment, a gradual approach tends to produce fewer disrupted nights. There is no single right answer; both are legitimate. Choose based on what feels realistic to sustain and what you know about your baby's response to change.

Starting with naps in the cot first

Whether or not you choose a formal gradual transition, starting with daytime naps in the cot is almost always useful. Naps are lower stakes than nights: if a nap is disrupted by the new environment, the consequences are a shorter nap and an earlier next feed rather than a difficult night for the whole family. This makes nap time the ideal rehearsal space for a new sleep location.

During cot naps you can also observe how your baby is settling: whether the space feels too large, whether the temperature is appropriate (cots are often in a different position in the room from the bassinet and may have different airflow), and whether any of the adjustment techniques you have tried, such as scent transfer or rolled towels under the mattress, are having an effect. A few successful cot naps before the first night builds confidence on both sides.

Troubleshooting: what to do if the transition stalls

Some babies resist the cot for several nights before settling. A few things are worth checking if the transition is proving difficult. First, room temperature: cots are often positioned away from the bassinet spot and may be warmer or cooler. Adjusting the sleep sack TOG or checking the temperature with a room thermometer is a quick first step. Second, white noise: if your baby is used to a white noise machine, make sure it has moved with them and is placed at the same distance and volume as before. Changes to sound environment can disrupt sleep even when the primary change was something else.

Third, consider whether two changes have been made simultaneously: moving to the cot and changing the settling approach. If you moved to the cot and removed a feed to sleep or a rocking routine at the same time, it may be the settling change rather than the cot itself causing difficulty. Reintroducing the familiar settling routine in the new space, even temporarily, can help the baby associate the cot with sleep before you address anything else. Transitions are easier one at a time.

Frequently asked questions

When should I move my baby from bassinet to cot?

The key safety trigger is when your baby is approaching the bassinet's weight or length limit, or when they can push up on their hands and knees, whichever comes first. Most bassinets have a weight limit of around 9 kg (20 lbs) but some are lower. Length limits typically mean the baby's head or feet touch the ends. Developmentally, you should always make the move before your baby can sit up unassisted in the bassinet, as a baby who can do this could topple it. In practice, most families make the move somewhere between 3 and 6 months.

Should the cot be in my room or the baby's room?

NHS guidance recommends room-sharing for at least the first six months and ideally the full first year. This means moving from bassinet to cot ideally means moving to a full-size cot in your own bedroom, not automatically moving the baby to a separate room. If your room cannot physically accommodate a full cot, a bedside cot or a large travel cot next to your bed are common solutions.

How do I make the cot feel less overwhelming for my baby?

A full-size cot can feel very large to a baby used to the snug walls of a bassinet. Placing rolled towels under the mattress cover (never loose in the cot) along the sides can give a slight sense of enclosure. Some parents also try a sleep sack with a lower TOG than usual to avoid overheating while still giving a sense of being held. Starting with naps in the cot before nights makes the new environment feel more familiar before the full transition.

How do I transfer my baby's scent to the cot?

One of the most effective techniques is to sleep with the cot sheet for a night or two before putting it on the cot mattress. The baby recognises the parent's scent and finds it calming when they encounter it in their sleep space. Some parents also place a piece of their clothing (without any loose strings or small parts) near the cot, not inside it, before the move. The same principle applies to a swaddle or sleep sack: if they have been wrapped in it near you, it carries your scent.

Should I do a gradual transition or a cold turkey switch?

Either can work. A gradual transition, starting with one nap per day in the cot while keeping nights in the bassinet, gives the baby time to associate the cot with safe sleep before spending a whole night there. A cold turkey switch sometimes works better for younger babies (under 4 months) who adapt quickly. Older babies, especially those who have had several months in the bassinet, often do better with a gradual approach. There is no single right answer; use whichever method feels most manageable for your family.

Is it safe to keep using the bassinet past the weight limit?

No. Weight limits on bassinets exist because the structure is only tested for stability and integrity up to that point. Using a bassinet past its weight or size limit carries a genuine risk of the bassinet tipping, the base giving way, or the mesh sides being compromised. Once your baby has reached the limit, please make the move to the cot promptly.

This article is for general information only. If you have concerns about your baby's sleep or health, speak to your health visitor or GP.