Foldable frame assembly for a stroller, the frame assembly being foldable between a use configuration and a storage configuration, wherein the frame assembly comprises: - a first forward lower frame component with a first end configured for attachment of at least one forward wheel and with an opposite second end attached to a first swivel joint assembly; - a second rearward frame component with a first end attached to the first swivel joint assembly and with an opposite second end configured for arrangement of a handle assembly; - a third rearward lower frame component with a first end attached to a second swivel joint assembly arranged on the first frame component between the first end and the second end of the first frame component and with an opposite second end configured for attachment of at least one rearward wheel; - a rearward fourth link frame component with a first end attached to a third swivel joint assembly arranged on the second frame component between the first end and the second end of the second frame component and with an opposite second end attached to a fourth swivel joint assembly arranged on the third frame component, preferably between the first end and the second end of the third frame component; and - a locking mechanism adjustable between a locked position and an unlocked position, wherein the locking mechanism is configured to releasably lock the foldable frame assembly in its use configuration and/or storage configuration by releasably and internally locking at least one of the respective swivel joint assemblies, wherein the locking mechanism comprises an actuation element configured to adjust the locking mechanism between the unlocked and the locked position wherein the actuation element is arranged at a distance from a swivel axis of at least one internally lockable swivel joint of the respective swivel joint assembly, - characterized in that the second swivel joint assembly comprises brackets that guide any attached frame members of the third frame component inwardly towards a center of the frame assembly when folding the frame assembly from the use configuration into the storage configuration, in particular such that any rearward wheels attached to the frame members are moved towards each other when folding the frame assembly from the use configuration into the storage configuration. - a first forward lower frame component with a first end configured for attachment of at least one forward wheel and with an opposite second end attached to a first swivel joint assembly; - a second rearward frame component with a first end attached to the first swivel joint assembly and with an opposite second end configured for arrangement of a handle assembly; - a third rearward lower frame component with a first end attached to a second swivel joint assembly arranged on the first frame component between the first end and the second end of the first frame component and with an opposite second end configured for attachment of at least one rearward wheel; - a rearward fourth link frame component with a first end attached to a third swivel joint assembly arranged on the second frame component between the first end and the second end of the second frame component and with an opposite second end attached to a fourth swivel joint assembly arranged on the third frame component, preferably between the first end and the second end of the third frame component; and - a locking mechanism adjustable between a locked position and an unlocked position, wherein the locking mechanism is configured to releasably lock the foldable frame assembly in its use configuration and/or storage configuration by releasably and internally locking at least one of the respective swivel joint assemblies, wherein the locking mechanism comprises an actuation element configured to adjust the locking mechanism between the unlocked and the locked position wherein the actuation element is arranged at a distance from a swivel axis of at least one internally lockable swivel joint of the respective swivel joint assembly, - characterized in that the second swivel joint assembly comprises brackets that guide any attached frame members of the third frame component inwardly towards a center of the frame assembly when folding the frame assembly from the use configuration into the storage configuration, in particular such that any rearward wheels attached to the frame members are moved towards each other when folding the frame assembly from the use configuration into the storage configuration.