The symptoms of the flu and COVID-19 have some differences.
People who have the flu will typically experience symptoms within 1–4 days. The symptoms for COVID-19 can develop between 1–14 days. However, according to 2020 research, the median incubation period for COVID-19 is 5.1 days.
As a point of comparison, the incubation period for a cold is 1–3 days.
The symptoms of COVID-19 are similar in both children and adults. However, according to the children typically present with fever and mild, cold-like symptoms, such as a runny nose and a cough.
Here Dr. Danish Salim of PRS Hospital explains in details about the main differences of covid fever and normal fever. Very informative video. Please watch carefully.