An infant carrier apparatus comprises a support frame, a seat assembly and handle assembly respectively connected with the support frame, a backrest frame, and a child holding accessory. The child holding accessory can be detachably installed on the infant carrier apparatus, supported by the backrest frame and the handle assembly. In one embodiment, the child holding accessory includes a support bracket and an enclosure. For installing the child holding accessory, the backrest frame is adjusted to a position inclined forward. The child holding accessory can be then installed between the backrest frame and the handle assembly, wherein the child holding accessory has two opposite end portions respectively connected with the backrest frame and the handle assembly.