Sharraxaadda

I dont know its a firestation or what siren os for??calling firemen or alarming people in need but i just want to adress the issue that my nephew when starts crying when hearing this siren..
Now i hav a 5 month old baby when she hears this siren at late night or early morning she wakes up from sleep and starts crying badly for a long time..and its hard too make her quiet... dont know what to do :(