Everyone is born with some level of music aptitude, or potential to succeed in music (source).
According to music researcher Edwin Gordon, this aptitude can increase or decrease between birth and age 7, based on musical exposure and experience.
"The vocal range is remarkably wide from birth,” music education professor Lili Levinowitz wrote. "Infants can imitate and experiment with their vocal instruments: and even match pitch as early as three to four months of age. Purposeful singing can begin at around twelve months. At this time, adults can recognize snippets of songs to which youngsters have been exposed. Through continued exposure to spoken chant, songs, and vocal play, young children can develop the use of their singing voices during the remaining early childhood years.” (source)