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Population Characteristics
| Mother-Neonate Pairs1 | 44 |
| Sex of Neonate | |
| Male | 25 (57%) |
| Female | 19 (43%) |
| Maternal Race | |
| African-American | 43 (98%) |
| Hispanic | 1 (2%) |
| Age (days) | |
| Sample 1 | 4.3 (±1.0) |
| Sample 2 | 12.1 (±3.8) |
| Feeding Type (Visit 1; Visit2) | |
| Breast milk only | 11 (28%); 8 (21%) |
| Formula only | 20 (51%); 21 (54%) |
| Both | 8 (21%); 10 (25%) |
A total of 78 samples were collected from 44 neonates: 39 at the first time point (Visit 1) and 39 at the second time point (Visit 2).
