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From Shiapedia
2in1 pushchair travel system (imoodle.win)
A 2in1 travel system allows you to easily transfer your child from their car seat to their stroller without disturbing them. They are usually more expensive than pushchairs however they provide more convenience and flexibility.
Select a model that is compatible with your lifestyle and needs for travel. Consider a car seat-stroller 2in1 combo that will grow with your child, or one with a large basket that can hold everything from nappies up to the day's food.
Convenience
A 2 in 1 pushchairs in 1 travel system is the ideal choice for parents who wish to take their baby with them on regular trips. The travel system includes the pushchair that can be attached to a car seat making it easy to transfer your baby from the car into the pram. This type of travel system comes in a variety of combinations, so it's important to choose one that is compatible with your needs. Look for a pushchair 2 in 1 with plenty of features, including a large basket, and the ability for the pushchair to fold easily to be stored. You can find models that allow you to put the car seat either forward-facing or reverse-facing. This is a great option for babies that aren't yet fully able to walk.
Flexibility
A baby travel system is a lifesaver. Leaving the house with babies can be hard enough. Baby wipes, nappies, clothes and bottles take up more space than you thought. It becomes even more difficult when you add a car seat. You have to remember the nappies, keys, wallet and phone and the baby sleeping that you don't want to disrupt. A 2in1 travel system offers you a pushchair as well as a car seat that are attached to the same frame, so you don't need to wake your child to get them into the car. This kind of pram is a great choice for parents due to its versatility.
Some travel systems can be used with a carrycot and seat unit, while others can be used with only a seat unit (carrycot not included). It is important to take into consideration this flexibility when selecting your pram.