Final answer:
The high infant mortality rate in Puritan New England was due to a lack of medical science, no antibiotics, harsh climates, and potential malnutrition, not witchcraft.
Step-by-step explanation:
The reason for the high infant mortality rate in Puritan New England can be attributed primarily to the lack of medical science and the absence of antibiotics. Other contributing factors included the harsh climate, poor living conditions that facilitated the spread of disease, and the possibility of malnutrition if crops failed. While the Puritans believed in witchcraft, it was not a factual cause of infant mortality but rather a reflection of the cultural and religious beliefs at the time