Baby support

A seat surface (4) and a backrest (6) are inclined very shallowly. The length of backrest is varied in the direction of spine of an infant sitting in a reboard system (1) when the child is in reboard system and/or when the reboard system is fastened on a car seat opposite the direction of travel. Backrest is composed of an unchangeable portion (9) and an extendable portion (10). An independent claim is also included for an infant seat.