“Container baby syndrome”: what it is and how to avoid it

by Anya Dunham, PhD

Most attentive parents don’t need to seriously worry about container baby syndrome, but babies do benefit greatly from natural movement.

There is a good chance you have come across a term “container baby syndrome” somewhere on the internet. I haven’t been able to find its definition in the scientific literature or any official documents of the American Academy of Pediatrics. The American Physical Therapy Association uses this term to describe a collection of movement, behavior, and other problems seen in babies who spend too much time in devices (or “containers”) that inhibit movement.

“Baby containers” include often-necessary devices like car seats and strollers, but also baby play equipment: bouncy chairs, Bumbo-type moulded floor seats and other sit-me-ups, swings, exersaucer-type activity centers, and other seating devices. I’ve heard moms jokingly refer to these seats as “the circles of neglect”. They are certainly convenient for parents, and babies often seem like they are comfy and having fun.

How much time is your baby spending in containers?

When my eldest was a baby, our living room was taken over by an exersaucer, two playmats, a baby lounger, and a Bumbo seat. Whenever I needed to get something done - prepare a snack, clean up, or go to the bathroom – I would pop her in one of those devices.

But one day, I added up the time she was spending in these devices, plus her stroller, high chair, and car seat. It was quite a bit.

Give it a try and see how much time your baby is spending in containers – especially relative to the total amount of time she or he is awake during the day. It can easily be 50% or more!

Are “baby containers” harmful?

Manufacturers often claim that baby play equipment delivers developmental benefits. Yet, to my knowledge, researchers have not found any so far. In fact, one study showed a correlation between time spent in “containers” and slower motor development.¹ (All babies still developed within the typical range, but this study didn't include cases of very extensive use. If it had, it is plausible that not all babies would have followed the typical motor development progression.)

According to the American Physical Therapy Association, staying in a container for a prolonged period of time can cause issues such as flat head, torticollis, vision problems, and decreased strength and coordination. This is not because containers are harmful themselves, but rather because of what babies are not able to do while spending time in containers, which is move naturally.

And natural movement is important.

• Moving their arms and legs, stretching, and reaching helps babies to naturally develop the strength and coordination they need for rolling over, crawling, and sitting up.

• Most (although not all) babies crawl before they walk. Crawling comes with a number of developmental benefits: it helps strengthen the muscles and joints in baby’s tummy, back, neck, hips, and shoulders. As babies begin to crawl, they experiment with moving between different positions, like going from hands-and-knees to sitting, which requires shifting their weight, rotating, and bending. These transitional movements expand babies’ freedom and independence, so they are not “stuck” sitting or standing. In addition to gross motor benefits, crawling helps with fine motor skills by developing arches, joints, and muscles in the hand.²

• And, interestingly, crawling helps with brain development. When a baby first begins crawling, he has to plan which arm goes first and which leg goes with it, until crawling becomes automated and he no longer has to think about it. Such ‘motor planning’ is believed to strengthen and coordinate neural activity.^3,4 The same motor planning takes place when older children learn to jump, throw, or ride a bike. Refining and automating movements frees up children’s brainpower for the thinking, reasoning, and creativity they need for formal learning.⁵

• Natural movement is also important for sensory integration: the ability of the brain to process and organize input received from multiple senses. Think of the various sensory inputs as pieces of a jigsaw puzzle: the brain has to put them together to form a complete picture. Unlike most other aspects of development, sensitive windows for sensory integration occur very early in life.⁶ For best sensory integration, babies need to engage multiple senses in a coordinated way: for example, they need to hear barking and see the dog at the same time. But unlike adults and older children, when babies want to really look at something, they cannot simply shift their gaze to the side: they need to align their whole torso, head, and eyes and turn toward the object to see it well and pay attention to it.⁷ Because of this, babies benefit from being in positions that allow them to move freely. Spending long periods of time in ‘containers’ limits a baby’s visual field and thus reduces opportunities for sensory integration. (So does watching screens)

In addition, some floor chairs, like sit-me-up or Bumbo-type seats, can put the baby in a position where their pelvis is tipped back, which isn’t optimal for posture and can put pressure on baby’s oesophagus.⁸

What can we do to avoid “container baby syndrome”?

I don’t think most loving, involved, attentive parents need to worry about container baby syndrome in an “oh-no-my-baby-won’t-develop-properly” sort of way. For most modern families, it’s not possible to completely avoid “containers”: your baby must always be buckled safely in a car seat when travelling in a vehicle; a walk in a stroller or a baby carrier can be a wonderful part of your family’s daily routine; and safely placing your baby in a baby seat or swing from time to time is not going to be harmful in and out of itself.

But with that, there is quite a bit you can do to support your baby’s natural movement:

• Try to be moderate and intentional in how much you use “container” equipment. Consider giving your baby plenty of opportunities for free movement, especially on days when she has to spend a considerable amount of time in a car or stroller.

• If you are bottle-feeding, don’t place your baby in an infant seat but cradle her against you. Gently support her, making sure her torso, neck, and head are in a straight line. She will be comfortable this way, and will be able to see your face and feel your touch. (Another great benefit of this approach: Some of the long-term benefits of breastfeeding have been attributed to the nurturing and close contact — the touching and gazing — breastfeeding provides.⁹ Whether you are bottle-feeding expressed breastmilk or formula, holding your baby will help you develop a close, nurturing feeding relationship.)

• Before your baby can comfortably sit on her own, get down on the floor with him instead of scooping him up to “sit” on your lap for reading or playing.

Finally, consider creating something that has been absolutely invaluable to me in raising all 3 of my babies: a 100% safe play space. This could be a play yard, a gated-off area or a whole room if your home allows.

The most important thing is that this play area must be absolutely, completely safe for your baby. It cannot be almost completely safe: “I just have to watch that he doesn’t pull on the blinds” means the area is not completely safe. Magda Gerber, the founder of the Resources for Infant Educarers (RIE), invited parents to think of a “safe place” as so safe that if you accidentally got locked out of the house, your baby might end up hungry and wet, but would be completely unharmed.¹⁰ Of course, getting yourself locked out of the house is never recommended, but you get the idea!

A simple way to create a play area is to enclose part of a room using safety gates. Gates may seem confining to adults, but to babies they can provide a sense of safety and freedom. As your baby figures out routines and patterns and becomes used to his play area, he will know that he’s free to explore. He won’t bump his head on a sharp corner or keep hearing “no” as he probably does when he navigates other spaces set up for adults or older children. This is why Janet Lansbury - whose work has been an inspiration and a source of learning for me over the last 10 years – coined the term “YES space” for it. Janet describes safe play spaces on her blog, in her book Elevating Childcare¹¹, and her podcast, Unruffled. 

Using hundreds of scientific studies, Baby Ecology connects the dots to help you create the best environment for sleep, feeding, care, and play for your baby.

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Warmly,

Anya

Hi! My name is Dr. Anya Dunham. I'm a scientist with a PhD in Biology, an award-winning author, and a mom to three young kids. Here and in my book, Baby Ecology, I analyze the research on baby's first year to find the optimal nurturing environment — the (usually wide) range of good options — to help you choose what works best for your baby and your family. Let's find the answers to  your new parent questions that are too complex to google. 

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