There is evidence that fibrinogen deficiency plays a significant role in TIC, particularly in children. The FEISTY Junior Trial therefore aims to replicate FEISTY, appropriately modified for the paediatric population of 3 months to 18 years. As there are no published studies comparing Fibrinogen Concentrate and Cryoprecipitate in the paediatric population, the aim is to develop an evidence base in paediatrics that is as robust as that in the adult setting for severe traumatic haemorrhage.