Wintertime brings more than crackling fires to warm the house and Frosty. The cold brings sniffles, sneezes, sore throats and illnesses that put a damper on the new season. Children, with immune systems that aren’t as developed as adults, are particularly susceptible to the mass amounts of germs floating around that cause the flu and colds and other medical problems.“One of the things parents need to understand is that your average healthy child can have as many as six colds per year,” said Dr. Vivian Lennon, the medical director of the primary care center at Children’s Healthcare of Atlanta.