Final answer:
A breech presentation is the term used when an infant's buttocks or feet are positioned to come out first during childbirth.
Step-by-step explanation:
The term used when an infant's buttocks or feet present first during childbirth is known as a breech presentation. This occurs in fewer than 5 percent of births. There are different types of breech positions, such as the complete breech where both legs are crossed and facing downward, and the frank breech where the legs are oriented upward. Historically, breech presentations could be delivered vaginally, but in modern medical practice, a caesarean section is often preferred to deliver breech infants safely.