A child's booster seat is provided and can include a booster seat base and seat back. The booster seat base can be collapsed or folded from an in-use configuration to a collapsed configuration to improve portability of the booster seat base. The booster seat base can include multiple seating surface panels that are rotatably coupled to one another to allow the booster seat base to be collapsed from an in-use width to a collapsed with that is less than the in-use width. The booster seat base can also be coupled and decoupled from the booster seat back. The booster seat base can include tab members that can be inserted into tab receiving cavities of the booster seat back. Adjustment of the booster seat base from the in-use configuration to the collapsed configuration can also facilitate removal of the tab members from the tab receiving cavities of the booster seat back.