A study, published in the Journal Bone , reported that supplementation with Vitamin D was associated with significantly greater length of the fetal femur which was measured by sonography in the 2nd and 3rd trimesters compared to placebo. It was also noted their was an increased growth of proximal metaphyseal, mid shaft and distal metaphyseal sections of both the femur .
These findings suggested that vitamin D supplementation in early pregnancy improves fetal bone health , and may have particular importance in parts of the world where growth stunting or osteoporosis are more prevalent. Source: Bone Journal