The same number of preterm infants and full-term infants in the study reached a level of immunity considered protective against the diseases.
此研究中达到一定免疫水平的早产儿和足月婴儿数量相同。
Vitamin D Exclusively breastfed healthy, full-term infants from birth to six months who have adequate exposure to sunlight are not at risk for developing vitamin D deficiency or rickets.