Table 1.
Maternal and infant characteristics.
| Lactation Period | ||||||
|---|---|---|---|---|---|---|
| 5–11 Days | 12–30 Days | 1–2 Months | 2–4 Months | 4–8 Months | p Value | |
| (n = 90) | (n = 90) | (n = 90) | (n = 90) | (n = 90) | ||
| MOTHER | ||||||
| Age (years), Mean (SD) | 27 (4) | 27 (3) | 28 (4) | 27 (4) | 26 (4) | 0.005 |
| Height (cm), Mean (SD) | 160 (4) | 160 (5) | 161 (5) | 161 (5) | 159 (5) | 0.102 |
| Weight (kg), Mean (SD) | 60.7 (8.7) | 60.8 (7.9) | 61.9 (8.9) | 58.4 (8.3) | 56.2 (8.1) | <0.001 |
| BMI (kg/m2), Mean (SD) | 23.7 (3.2) | 23.7 (3.0) | 23.9 (3.1) | 22.5 (2.9) | 22.2 (3.1) | <0.001 |
| Gestational weight gain (kg), Mean (SD) | 16.7 (7.4) | 16.2 (6.0) | 15.9 (5.7) | 15.9 (5.9) | 14.9 (7.6) | 0.419 |
| Postpartum weight loss (kg), Mean (SD) | 9.1 (6.1) | 8.6 (5.3) | 9.8 (4.0) | 10.0 (6.2) | 10.6 (5.9) | 0.119 |
| Non-Smoker, n (%) | 90 (100) | 89 (99) | 90 (100) | 86 (98) | 89 (100) | 0.176 |
| Cesarean delivery, n (%) | 39 (42) | 43 (48) | 53 (59) | 35 (39) | 35 (38) | 0.004 |
| Household income (RMB/month) | ||||||
| <2000 RMB, n (%) | 20 (22) | 17 (19) | 24 (27) | 26 (29) | 31 (34) | |
| 2000–4000 RMB, n (%) | 37 (41) | 45 (50) | 41 (46) | 40 (44) | 41 (46) | |
| >4000 RMB, n (%) | 30 (33) | 22 (24) | 23 (26) | 22 (24) | 18 (20) | |
| Unknown, n (%) | 1 (1) | 6 (7) | 2 (2) | 0 (0) | 0 (0) | 0.206 |
| INFANT | ||||||
| Males, n (%) | 51 (57) | 48 (53) | 48 (53) | 54 (60) | 43 (48) | 0.865 |
| Gestational age at birth (weeks), Mean (SD) | 39.3 (1.2) | 39.2 (1.3) | 39.2 (1.6) | 39.4 (1.3) | 39.5 (1.5) | 0.684 |