Maternal and Infant Characteristics (n = 184)
| Characteristic | Value |
|---|---|
| Age of infant, No. (%) | |
| <2 mo | 11 (6.0) |
| 2–3.9 mo | 112 (60.9) |
| 4–5.9 mo | 61 (33.2) |
| Race, No. (%) | |
| White | 175 (95.1) |
| Asian | 9 (4.9) |
| Hispanic | 5 (2.7) |
| Black or African American | 3 (1.6) |
| American Indian/Alaskan Native | 2 (1.1) |
| First-time mothers, No. (%) | 73 (40.1) |
| Number of children, median (range) | 2 (1–8) |
| Practice location, No. (%) | |
| Urban | 108 (58.7) |
| Suburban | 70 (38.0) |
| Rural | 7 (3.8) |
| Feeding characteristics | |
| Breast milk only, No. (%) | 140 (76.1) |
| Breast milk and formula, No. (%) | 44 (23.9) |
| Supplementing infant with vitamin D, No. (%) | 101 (55.2) |
| Age when infant began supplementation, median (range), wk | 2 (0–17) |
| Mother taking supplement with vitamin D, No. (%) | 138 (75.8) |