Choosing a double stroller is one of the more consequential gear decisions you will make as a parent of two. Once you have decided that a single stroller will not cut it, the next question arrives quickly: side by side or tandem? Both configurations carry real advantages, and both come with genuine compromises. The right answer depends on where you live, what car you drive, the age gap between your children, and how you actually move through your daily life.

This guide breaks down each configuration across every decision factor that matters, from doorway widths to car seat compatibility to how the stroller handles on a Montreal winter sidewalk. By the end, you will know exactly which double stroller type fits your family and what to look for when you test one in person.

What Makes a Double Stroller Side by Side Different from a Tandem

A side-by-side double stroller mounts two seats laterally on a single frame. Both children sit at the same height, facing the same direction, with equal access to the view ahead and equal ability to recline. There is no front seat or back seat. Both children share the same experience, which matters more than most parents expect once the children become aware of each other.

A tandem double stroller, also called an inline stroller, positions one seat directly in front of the other. One child leads, one follows. The front seat typically offers a wider field of view; the rear seat tends to feel enclosed by comparison. Frame length is the trade-off for the narrower footprint.

A third category worth understanding is the convertible or expandable stroller. Products like the UPPAbaby Vista V3, Bugaboo Donkey 6, and Silver Cross Wave 3 begin as single strollers and accept a second seat attachment as a family grows. These are not dedicated double strollers; they are systems designed to adapt. That distinction matters when you are comparing frame dimensions, seat positions, and compatibility with infant car seats.

Frame width is the first practical difference. Side-by-sides span horizontally; tandems extend longitudinally. Before evaluating any other factor, it helps to understand which physical constraint is more relevant in your daily environment.

The Width Question: What No One Tells You About Doorways, Elevators, and Winter Sidewalks

The most persistent myth in the double stroller category is that side-by-sides do not fit through standard doorways. It is worth addressing directly: most modern side-by-side strollers measure at or under 29 inches wide. Standard residential interior doorways in Canada are commonly 28 to 32 inches wide, with 32 inches as a typical minimum for primary rooms such as bedrooms and main hallways. Accessibility-compliant spaces, including most commercial entrances and transit facilities, meet or exceed that standard. The width concern, as commonly stated, does not reflect the reality of most modern side-by-side designs.

The real constraint in Canadian urban environments is the elevator. Building elevators in Montreal, Toronto, and Vancouver, particularly in older apartment stock, often have interior doors in the 30 to 32 inch range. When a stroller is 29 inches wide and the door opening is 30 inches, the margin disappears quickly. Before purchasing any double stroller, measure your building elevator door opening, your front door, and the entrance of the grocery store or coffee shop you visit most often. Bring a tape measure. It takes five minutes and prevents months of frustration.

Winter sidewalks introduce a second urban-specific constraint. Packed snow, uncleared ice paths, and narrowed plowed lanes reduce effective sidewalk width significantly. A tandem stroller, which is typically 20 to 24 inches wide, holds a real navigational edge in those conditions. A side-by-side that performs beautifully in October may feel unwieldy on a February sidewalk in NDG or the Plateau.

The honest summary: the width myth is mostly false, but your specific building and neighbourhood determine which configuration works best. Measure before you buy, not after.

Maneuverability, Steering, and Everyday Push Feel

How a stroller pushes with weight in it is very different from how it feels empty on a showroom floor. This is one of the most important things to understand before testing any model.

Side-by-side strollers distribute weight evenly across their width. The center of gravity sits low and centered, which produces responsive, balanced steering. Turning radius is generally tight, and the stroller does not pull to one side when one seat is occupied and the other is not. For jogging and all-terrain use, side-by-sides are almost universally preferred. The even weight distribution and wider stance create stability on grass, gravel, and uneven pavement that tandem frames simply cannot replicate.

Tandem strollers have a longer wheelbase. Weight distribution shifts depending on which child sits where, and heavier front-seat occupants create a forward-weighted push that requires more effort on inclines and tighter corners. Popping a curb with a loaded tandem stroller is noticeably harder work than with a side-by-side. In a tight grocery store aisle, however, the narrower profile of a tandem wins clearly.

The practical split: tandem for dense urban navigation through narrow spaces; side-by-side for parks, paths, trails, and anywhere the terrain is varied. If your daily life involves both, weight the environment you use most frequently.

Twins, Siblings, or an Age Gap: Which Configuration Actually Fits Your Family

The right configuration is not universal. It depends on the age and developmental stage of both children, and more specifically on how far apart they are in age.

For twins, the side-by-side is generally the preferred starting point. Both infants need full recline, ideally with infant car seat adaptors during the newborn phase. Side-by-side frames more commonly support two infant car seat positions simultaneously. As twins grow, the equal seating and shared sightline support social interaction, which matters for development and for keeping both children content on longer outings.

For a baby and a toddler with a gap under 18 months, a convertible single-to-double system often makes more practical sense than purchasing a dedicated double stroller. The toddler rides in a rumble seat or second position while retaining the option to walk, and the frame reverts to a single configuration when the second seat is no longer needed.

For a baby and an older child with an 18 to 36 month gap, evaluate the rumble seat weight limit carefully. Most rumble seats cap at 35 pounds. An active 30-month-old may be approaching that limit already. A side-by-side may offer a better long-term option if both children will need full seating for an extended period.

The table below provides a structured decision framework:

One practical note: not all tandem configurations support full recline in both positions. Before purchasing any tandem or convertible system for a newborn, confirm that the second seat reclines fully flat or accepts an infant car seat adaptor. This is not guaranteed, and it varies significantly by model and brand.

Fold, Storage, and Getting It In and Out of Your Car

Double strollers are large. How they fold, how they fit in your car, and how easy they are to lift and load matters every single day.

Side-by-side strollers fold into a wider, shorter shape. They fit easily in most SUV and minivan trunks, but they can challenge compact sedans and crossovers with narrow trunk openings. The width of the folded stroller, not the overall volume, is the binding constraint most often overlooked.

Tandem strollers fold into a longer, narrower shape. This profile fits more predictably in sedan trunks but can be awkward in tight garage storage or narrow apartment storage rooms. The extra length also makes lifting into a hatch or SUV rear more physically demanding for shorter individuals.

Fold mechanism quality varies significantly. A one-step fold, like the system on the Baby Jogger City Mini GT2, is a genuine daily quality-of-life advantage when you are doing it a dozen times a week. Multi-step folds that require removing seats or releasing multiple latches add seconds that compound over time.

Weight is the factor most parents underestimate until they are doing it alone. All-terrain and jogging double strollers can reach 30 to 35 pounds or more. Know your comfortable lifting threshold before choosing a frame.

The only reliable way to assess trunk fit is to fold the stroller and place it in your car. Most retailers with floor models will allow this. Take the measurement of your trunk opening width and depth before you visit so you can compare against spec sheets before testing.

Car Seat Compatibility: What to Know Before You Buy a Double Stroller in Canada

Car seat compatibility is not universal, and the stakes of getting it wrong are high. Not all double strollers accept two infant car seats, and even when they do, the compatible car seat brands are model-specific and adaptor-dependent.

Side-by-side frames are generally more compatible with dual infant car seat configurations. Because both positions sit at the same height on the same frame, adaptor fitment is consistent across both seats. Brands like UPPAbaby, Bugaboo, Baby Jogger, and Nuna publish compatibility charts that specify which of their infant car seats, including the UPPAbaby Mesa, Nuna Pipa, and Maxi-Cosi Mico, work with their double frames and which adaptors are required.

Tandem frames typically designate one seat, usually the front or parent-facing position, as the infant car seat position. The rear or rumble seat may not accept a car seat at all, or may require a separate and less widely available adaptor. If you are planning to use two infant car seats, confirm this before purchase, not after.

Canadian families using Clek or Maxi-Cosi car seats should pay particular attention to adaptor ecosystems. Canadian-market car seats are subject to Health Canada standards and CMVSS compliance requirements that may differ from US or European models. Adaptors sold in Canada are not always identical to those sold elsewhere, even under the same brand name. When in doubt, verify with a retailer who carries both the stroller and the car seat line.

A note on snap-and-go or frame strollers: for newborn twins, a dedicated infant car seat frame stroller designed for two car seats is often the lightest and most manageable solution during the first six months before transitioning to a full double frame. Staff at a specialty retailer can help you map out a transition plan that accounts for both phases.

How We Help Families Choose at Kido Bébé

Every double stroller decision we see in-store comes down to three questions: where will you use it most, what does your building situation look like, and what car do you drive. Those three answers narrow the field faster than any spec comparison.

Parents who test in-store consistently tell us that their online shortlist changes after a 10-minute push test with weight in the seats. A stroller that reads well on paper can feel cumbersome when loaded and steered through a tight corner. A model that seemed too wide on a website can clear a doorway with room to spare. Physical testing removes guesswork from a decision that affects daily life for two to three years.

Kido Bébé carries side-by-side and tandem models from the brands most requested by Canadian families. Our staff are trained on configuration fit, not just product specs, and can verify car seat compatibility live using the actual seats and adaptors rather than relying on published charts that are not always current.

Our Montreal boutique also allows real folding tests. If you bring your car measurements or, better, park nearby and invite us to test the fold in your trunk, we will do it. That level of confirmation before purchase is not available through an online retailer.

There is no pressure to buy on the day you visit. The goal of an in-store appointment is information. Book a time when we are less busy, bring your tape measurements, and come with both children if you can. The difference between choosing a stroller you will use confidently every day and one that ends up in a storage room often comes down to a 20-minute conversation with someone who has seen hundreds of families go through the same decision.

Explore our full selection of double strollers or browse by brand to find the configuration that fits your family.

Double Stroller Collection

The Bottom Line — Side by Side or Tandem, the Right Stroller Is the One That Fits Your Life

Choosing between a side-by-side and a tandem double stroller is not a matter of one being objectively better than the other. It is a matter of which configuration fits your building, your car, your children's ages, and the routes you actually travel every day.

Side-by-sides win on equal seating, dual car seat compatibility, steering balance, and all-terrain performance. Tandems win on narrow-profile navigation, urban density, and flexibility for families with a meaningful toddler-to-infant age gap. Convertible systems bridge both worlds but come with their own trade-offs around seat position, recline, and weight limits.

The families who are happiest with their double stroller decision are the ones who tested with weight in the seats, measured their elevator and trunk before buying, and matched the configuration to how they actually live rather than to a best-of list.

If you are still weighing your options, our team at Kido Bébé is here to help you work through it in person. Browse our double stroller collection online, then come in to push, fold, and fit before you commit. The right stroller is out there, and it usually takes one good test drive to find it.