A chassis is the metal frame that is the main body of the pram or stroller, it connects the frame and wheels to the seat unit. However, the seat unit is, at times able to come off and be replaced with a carrycot or car seat, this is then a travel system, as it allows your little one to sit, sleep or ride in the car whilst being comfy and safe.
Baby Carrycots are small, lightweight lie-flat baby carriers that double up as a bed, they can be attached to compatible strollers as well as used separately. They're particularly useful if you don't want to disturb your baby when you're moving about the house or if you are going out and about, your baby will have a comfortable and familiar place to rest. They're suitable from birth until around 3-4 months old or 9kg, this can vary between different carrycots and different babies so please check the product descriptions.