IBCLC Practice Exam 2025 – Complete Preparation Guide

The correct answer is that all breastfeeding infants should be supplemented with 400-800 IU of vitamin D per day. This recommendation is based on the understanding that breast milk typically does not contain adequate levels of vitamin D to meet an infant's needs for bone health and overall development.

Healthcare organizations, including the Academy of Breastfeeding Medicine, emphasize supplementing vitamin D to help prevent rickets and ensure proper calcium metabolism. The designated range of 400-800 IU aligns with current guidelines, which indicate that a daily intake of 400 IU is the minimum sufficient amount for most breastfeeding infants, particularly in the first few months of life when they are exclusively breastfed.

This range also accommodates different individual needs as some factors—such as maternal vitamin D status, geographic location, and sunlight exposure—can influence how much vitamin D an infant synthesizes naturally. By setting this range, the Academy of Breastfeeding Medicine aims to promote the health and well-being of infants during a vital stage of growth and development.