Buy Babyzen YOYO+ 6+ Stroller. The Babyzen YOYO+ 6+ version is for 6 months old child who can sit more upright in a stroller. YOYO+ Plus 6+ has new padded 6+ seat, carry strap and extendable canopy with UPF 50+ sun protection. The YOYO+ is lighter, more compact and more likely to qualify as an airplane carry-on. YOYO+ 6+ attach with Cybex Aton, Aton 2, Aton Q or Cloud Q infant car seat to create a sleek and compact travel system.