The handle of the Doona car seat is adjustable to provide greater convenience and comfort. To adjust the height of the handle, locate the buttons on either side of the handle. Press both buttons simultaneously and lift or lower the handle to the desired position. The handle can be set in three different positions, depending on your preference. Once you have adjusted the handle, ensure that it clicks into place, and the buttons pop back up. The handle should feel sturdy and secure when lifted, providing a comfortable grip for carrying your baby.