In the Spanish royal family, the dynastic children of the monarch and the heir to the throne are entitled to the title and rank of infante in the style of Royal Highness (infantes by birth). A second category of infanta may be granted this title by royal decree (infantes by grace), but bears only the title of highness.  Previously, the title and rank of Infante of Spain was often conferred on the parents and in-laws of Spanish monarchs, but unlike those created under the 1987 decree, their dynastic wives were automatically infantes and the holders of the title were Royal Highnesses. Some or all of the entry was imported from the 1913 edition of Webster`s Dictionary, which is now royalty-free and therefore in the public domain. Imported definitions may be considerably outdated and new meanings may be completely absent. (See entry for infanta in Webster`s Revised Unabridged Dictionary, G. & C. Merriam, 1913) From Old Portuguese infante, from Latin infans, infantem (“child”). From Infante Spanish and Infante Portuguese, both from Latin īnfāns (“child”). Duplicate infant. Related to infantry. Afonso, Prince of Beira, eldest son of Duarte Pio and heir to the throne, is called the Prince of Beira, not the Infante. Related to Galician infantes, Spanish infantas, French children and Italian infantas.
After the accession of the House of Bragança, the honorary title “Sereníssimo” was preceded by the title of infante (Sereníssima for an infanta), since the full name of this dynasty was “Sereníssima Casa de Bragança”, a style conferred by the pope. However, the style does not appear to have been used with the title Prince Royal. Like the Children of France, all the Infantes of the different Iberian kingdoms were princes of the Royal Blood, although since 1987 the Spanish sovereign could also confer the title of infantado by decree on a person (usually the spouse of an infanta or infanta) who is not of royal descent. Infante (Spanish: [iɱˈfante], Portuguese: [ĩˈfɐ̃t(ɨ)]; f. French children of France) and historically declared that the infante or infanta was the child of the monarch of the nation. In addition, some distant relatives of the Spanish rulers, usually children of infants by grace, received the “honor and treatment” of infants or infants, but not the title itself. This category included the children of the second marriage of Infante Carlos de Borbón-Dos Sicilias to Princess Louise of Orleans, those of Infante Fernando de Bavaria y Borbón to Infanta Maria Teresa of Spain.  and the marriage of Infante Alfonso of Orléans-Borbón to Princess Beatrix of Saxe-Coburg and Gotha (e.g. Princess María de las Mercedes of Bourbon-Two Sicilies, Countess of Barcelona, Prince Alvaro of Orléans-Borbón, Duke of Galliera).  infante m (plural infantes, female infanta, feminine plural infantes) From a variant of Old Spanish ifante, from Latin īnfāns, īnfāntem.
Portugal has been a republic since 1910. The close relatives of Duarte Pio, Duke of Braganza, head of the Portuguese royal family, using the title are: Spanish and Portuguese, literally, infant, from Latin infante, infans Infante initially had no female form in Portugal and can be compared to the infanções of the Portuguese minor nobility, who were also cadets of their families, with no prospect of inheriting the principal possessions of the noble families, to which they belonged, he distinguished himself in law by some privileges, but little inheritance. While the title belonged by right to all the sons and daughters of a monarch (even if they ceased to be the children of the reigning sovereign), it was also often given to the sovereign`s male sons-in-law and grandsons (e.g. Prince Ferdinand of Bavaria, Infante Pedro Carlos of Spain and Portugal), sometimes to other agnats of the ruling dynasty (e.g. Infante Enrique, Duke of Seville) and the monarch`s relatives (e.g. Infante Sebastian of Portugal and Spain, Infante Alfonso of Orléans-Borbón). Later, the word infanta appeared in Portugal as a feminized form applied to Portuguese princesses after the 16th and 17th centuries. Also according to Edward, King of Portugal, in the 15th century, the heir to the throne and his son or eldest daughter, if there was no son, were called “prince” or “princess”. The first prince in Portugal was the future Alfonso V, his eldest son, who may have adopted the French royal style through an English influence later imported from Philippa of Lancaster. Borrowed from Latin īnfans, īnfantem. Duplicate of the inherited Fante.