If you mean flu as in a common cold, baby will be just fine.
If you mean flu as influenza, then I'd be seeing you doctor asap as influenza can cause death.
Common colds are just the snotty head, cough, sore throat, temperatures, hot and cold sweats etc.
Influenza is where you can barely move because it hurts to move, high temps, sweats etc.
As in cold flu? As long as you dont have a high fever you should be fine. Im getting over the flu.