The baby on the front of the box in the Aspen carrier is only 10 months old. The Boba has the widest seat of any Soft Structured Carrier out there and therefore provides a wider seat for the baby to sit in. The seat alone of the Boba will provide adequate leg support until the toddler is around eighteen months. By this time the foot straps will compensate for the lack of material behind the knee and support bigger legs so that your little one’s knee is brought up to hip level. In short, your toddler will probably not use or need the foot straps until he/she is two years old.