If you have any concerns with your bubs flu, please get the hospital to check him out, especially with being so young. My little V was in ICU for a week due to catching the flu, turning into broncholitis within a matter of a day.
I dont want to worry you, but after seeing my little V go thru something that almost killed her and seeing all those other tiny babies in ICU going thru similar repiritory problems was a real eye opener for me.
I hope your little baby by gets better soon. Hugs