Exanthem subitum in infants is a viral infectious disease caused by human herpesvirus type 6 and type 7. Newborns initially acquire protective antibodies from their mothers. Generally, after five to six months, as antibody levels decrease, the likelihood of contracting a virus such as human herpesvirus increases. The peak age for contracting exanthem subitum is between six months and two years, although this can vary. Children aged three to four, who have not contracted exanthem subitum or the human herpesvirus before the age of two, can still contract the disease.