Blankets for calves promote the immune system in the early days and prevent the calves from getting diarrhoea and other health problems the risk of infection increases when the temperatures drop under 10 c the blanket will protect the animal when the weather suddenly changes prevents newly born calves from stress situations normally a calf would wear a blanket for 3 4 weeks sometimes even longer if needed not for use in large groups of calves kept in a large igloo details outer m