Some people say that if babies are covered too tightly, they are prone to "sultry syndrome", but if they are not covered enough, they are afraid that the delicate babies will catch a cold. What should babies cover to keep warm in winter? In winter, the warming measures for babies to sleep should be selected according to the age of the child. There are differences in the warming methods for newborns, infants and young children to sleep in winter. Let's take a look.