Apr 6, 2026 Yul So www.samitivejhospitals.com A research team led by Professor Hong Soo Jong at the National Medical Center, supported by the Korea National Institute of Health, has found that vitamin D deficiency during pregnancy may weaken a child’s immune system and increase the risk of allergies after birth. The study followed 322 children aged three to nine from a birth cohort focused on respiratory and allergic diseases. Researchers examined their responses to common al