Buying a Tandem Double Buggy
A tandem double buggy could be a great choice if you have twins, or children who are very close in age. They're smaller than side-by-side buggies, and ideal for maneuvering tight spaces such as entrances, on public transportation and on rocky terrain.
Some can be converted into travel systems that use two carrycots or car seats for children. However, they are heavier and longer than single pushchairs and may not be as stable when as they bump up the kerbs.
Convertible
There are a variety of options for adding a second seat or making a single stroller a double. The Vista V2 from UPPAbaby is a spacious, gorgeous stroller that converts easily from a single stroller to double by incorporating the rumble seat (available separately). However, it's pricey and less maneuverable than other dual strollers because the 2nd seat is located to the left of the front seat.
best double buggy is a similar model with great seating flexibility, however it lacks under-seat storage when used in doubles mode.
Other options include twin buggies that have all-terrain wheels as well as joggers that have fixed wheels that can be used to carry two children. They are more expensive, but they are designed for long trips on rough terrain and have more expensive resales.
Reclining the seat independently
If you're looking for a double stroller that can accommodate children of various age groups, you'll need one with independent seat recliner for both seats. This will allow your child's older to rest in the back while the baby sleeps in the bassinet, and reverse.
You'll also need to consider the width of the pushchair, as this will impact the ease of get through doors and on public transportation. If you have extremely narrow doorways then it might be a good idea to consider a side-byside pushchair like the Mountain Buggy Duet which has the advantage of having a footprint that is similar to a single buggy, but can still accommodate two seats and car seat adaptors.
Tandem buggies are generally longer than side by side models, making them more difficult to maneuver around and down kerbs. However, they can accommodate more combinations of seats/carrycots/car seats and are an excellent choice for twins and siblings of different age groups. They can also be more expensive than single-to double buggies, but are a good purchase if you plan to keep it for a long time and will have a decent amount of resale value should you decide to sell it after your children have grown out of it.

Another crucial thing to look for is if the seat backs can recline independently of one another since this will allow you to place your child in the most optimal position for napping or observation. This is especially important if you have a young child in the rear seat who will want to lie back and take a snooze while the more mature child wants to sit up and observe their surroundings.
A few brands have an exclusive seat design that allows the back seat to fully recline into a nearly flat position which is perfect for babies. The iCandy Orange, for example is a stadium-style seat that can be reclined into multiple positions. It also has UPF 50+ sun protection and windows that peek out.
Larger than twin buggies
They are great for siblings of different age groups, and they allow you to move about without having to worry about your children touching. They're typically a bit longer with one seat positioned behind the other. The seats can be reclined fully for infants, or put in an upright position for toddlers.
Mountain Buggy Duet is a popular option. It has the slimmest design side-by-side on the market and a footprint that is comparable to a single stroller. It also features an adjustable handle, which makes it easy for parents of different heights to push and a handbrake that is useful when tackling difficult terrains. It is suitable for use from birth, and it can be combined with a wide range of car seats and carrycots.
Another option is the iCandy Wave, which has an easy one-click fold and is able to be used in duo or mono mode. The clever frame expands in width to accommodate the second chair and can be used to accommodate up to two car seats or carrycots. This makes it an ideal choice for older siblings that want to sit together. It's slightly longer than some other models, but it's light to steer and has soft suspension to tackle kerbs.
There are plenty of 3-wheeler tandems with inline wheels that provide stability and fast steering. Take a look at Phil and Teds inline models, or iCandy Peach and Pear buggies. They are often folded into a single buggy if you are limited in space at home or you need to carry it from the car to the bus stop.
Be aware that a double wide buggy will be heavier and more bulkier than a single compact buggy. Be sure to know what you want before you purchase. It is likely to be used on buses, trains and subways frequently, therefore it must be simple to use and manage. It is possible that you will need to move the car seat on and off when you take your child to school or nursery.
The best time to start is when you are born.
Whether you're expecting twins or you have a child following your first, you're going to need to find an appropriate pushchair for the whole family. Double buggies tend to be heavier and bulkier, as well as more expensive than single strollers. However they are also easier to maneuver in tighter doorways or around obstacles such as curbs. Many are also compatible with piggyback ride-along boards (either from the manufacturer or as an accessory purchase) which means you can carry three children at once.
Tandem pushchairs place one child in the front of the other, and they're generally a better option for families with two children who are similar in age to function well together. They're not completely safe. Siblings who are sitting side-by-side could punch or kick each other, and children of different heights could argue over who is sitting higher. A tandem high-low model is able to solve this issue by elevating the seat to the rear, preventing your child's height from being sat on the bottom and not having any view.
The iCandy Wave is a great option for parents looking for an easy-to-use convertible double buggy that can fit both a newborn in a carrycot as well as an older child in the main seat. It features a clever frame that expands widthways when you add a second seat and folds down flat for compact storage. The seats are cushioned and comfortable, the straps easy to fasten and the buckles are among the most impressive we've seen in any of our tests. You can recline both seats independently, and the canopies are large and generous with UPF 50+ protection and peekaboo windows.
The only downside to the iCandy tandem is that it is a bit expensive. But a high-quality tandem will last you for many years and have an attractive resale value so at the end of the day you'll likely recover some of the cost. The iCandy doesn't have the same seating configurations as our other top selections. It's nevertheless a good option for families who don't want to spend lots of money.