An infant swing includes a carrier, a first foot, at least one arm, a second foot, a pivotal positioning mechanism, a driving device, and a power supply device. The arm is connected to the first foot and the carrier. A second pivot base of the second foot is pivotally connected to a first pivot base of the first foot. The second foot is used for supporting the carrier above a supporting surface cooperatively with the first foot and the arm. The pivotal positioning mechanism is disposed between the first pivot base and the second pivot base. The pivotal positioning mechanism is used for constraining rotation of the second foot. The driving device is used for driving the arm. The power supply device is used for providing electric power to the driving device so as to make the carrier capable of swinging relative to the first foot.