Which of the following best describes a crime considered infanticide?

Infanticide specifically refers to the act of killing a newborn infant, typically within the first year of life. This definition captures the most critical aspects of the crime, focusing on the newborn stage, which is characterized by the vulnerability and dependency of infants.

The legal definition of infanticide may vary by jurisdiction, but it often distinguishes this crime from other forms of homicide based on the age of the victim. While options that refer to a broader age range, such as children under the age of 18 or infants less than a year old, are not accurate in capturing the specific and legal nuances of infanticide. Similarly, killing a child during the first month of life could imply a broader interpretation than what is traditionally recognized. Thus, focusing on the killing of a newborn captures the essence of what infanticide is legally defined to be.