While there's plenty for parents to love about cold weather — snuggly scarves, hot chocolate dates — this time of year also comes with some downsides: runny noses, coughs and congestion. The CDC says flu season occurs between November and March. It's good to know what the flu symptoms are in kids and toddlers and what to do if influenza invades your house.Flu symptoms in kids are what you'd expectThe CDC notes that these are the most common symptoms of the flu: fever, cough, sore throat, runny or stuffy nose, muscle or body aches, headaches, fatigue and sometimes vomiting and diarrhea, which occur more often in kids than adults."However, symptoms can be varied even in one family," says Dr. Jen Trachtenberg. "A baby may have a fever, cough, be cranky and vomit, while an older sibling could have a fever, headache, sore throat and severe aches." Many of these overlap with cold symptoms, but they announce themselves differently."Colds, even really yucky ones, start out gradually," write Dr. Julie Kardos and Dr. Naline Lai, of Two Peds in a Pod. "Sometimes during a cold you get a fever for a few days. Sometimes you get hoarse and lose your voice. Usually kids still feel well enough to play and attend school with colds. The average length of a cold is 7 to 10 days, although sometimes it takes two weeks or more for all the nasal congestion to resolve. The flu, on the other hand, comes on suddenly and makes you feel as if you’ve been hit by a truck. The fever usually lasts 5 to 7 days. All symptoms come on at once; there is nothing gradual about coming down with the flu."Go to the doctor right away if you see these signsUnfortunately, there is no cure for the flu. "Most of the time, the treatment for healthy kids with flu is really supportive care: fluids, rest, steam and pain and/or fever reducer, as well as a lot of TLC," says Trachtenberg.With kids, though, you can never be too safe. "Some people are at higher risk of complications from the flu, and so these people may need to see a doctor, or at least call their doctor’s office," says Dr. Katie Lockwood. "This includes children under the age of 5 but particularly under the age of 2. Also, children with morbid obesity, on long-term aspirin therapy, immunosuppression, residing in a chronic care facility or with chronic medical conditions, such as congenital heart disease, asthma, or diabetes. Children who are at high risk may benefit from flu testing and antiviral treatment early in the course of their illness."For kids without these conditions, there are some red flags that signal you should take your kids to the doctor and/or hospital right away: trouble breathing, bluish skin color, dehydration, extreme fatigue, irritability, fever with a rash or prolonged symptoms. "For infants in particular," Lockwood notes, "you should take them to the doctor if they're not feeding well, have trouble breathing, are not making tears when crying or have significantly fewer wet diapers than normal." Dr. Jaime Friedman says there's another benefit to heading to the doctor if you catch on early that something's amiss: "Some doctors will prescribe Tamiflu if they diagnose a child with the flu in the first 48 hours of symptoms. If your child is sick with a high fever, call your doctor to be seen as soon as possible."The best things to do: Wash hands and get the flu shotOf course, the ideal would be to not get the flu in the first place. "The best defense is a good offense, so encouraging good hand-washing is super important," says Friedman. Getting a flu vaccine is also a critical step recommended by both the CDC and the AAP. The CDC reports that, of the 186 children who died of influenza-associated deaths during the 2017-2018 season, about 80 percent had not received a flu vaccination. Both organizations urge everyone 6 months or older (with a few exceptions) to get a flu shot.A vaccination isn't a guarantee that your kids won't get sick, but, even if they do, it helps. "Kids who have had the flu shot but still get the flu are at much lower risk of complications or death from the flu," says Friedman. Yes, it's a big ouch up front, but it might save a lot of pain in the long run. Use the CDC's "Flu Vaccine Finder" to find the closest flu shot near you.