The cosmo sp can be used from birth until 18kg approximately 4 years and provides all the important support your babys developing head and neck muscles need installed rearfacing for use up to 9kg the seat can then be used forward facing from 9kg to 18kg your little one is secured with a 5 point safety harness that can be adjusted with one simple pull and the chest and buckle straps are padded for comfort when used forward facing the seat has 5 recline positions and a wide firm base to