An apparatus comprises a seat flap to support a baby's buttocks and thighs in a sling like fashion. The seat flap has a top edge, a bottom edge and side edges. A first means joins the top edge to an upper portion of a baby carrier with the seat flap being positioned on an interior portion of the baby carrier. The baby carrier is configured to carry the baby on the front or back of a caregiver's body with the baby facing outward or inward. The baby carrier is operable to support the baby in an upright position without the use of the seat flap. A second means joins the bottom edge to a lower portion of the baby carrier, wherein the baby sits upright and the baby's legs are supported at an angle of at least ninety degrees.