I'm not sure what to do.. (imbecile cord)

[CountryGirl1099]

I got 4 bull calf's for dairy-beef. My one calf's  imbecile cord  ( i think thats what its called) is almost like swelling. I'm not sure exactly how old they are.. I would just like to know what i should do  :-\

 

[utshowgirl]

Penicillin, its a naval infection