A toddler is a young person who is just learning to walk. Toddlers are children who are around the age of 1 to 3 years old.
A virgin is someone, either male or female, who has never had sexual intercourse before. This term is usually only used on people who have reached puberty.
A visitor is someone who comes to visit someone else's home or land. A visitor who has been invited or welcomed is called a guest.