| Pregnancy term |
| Full-term | 52 | 33.3 | 104 | 66.7 | 0.686 |
| Pre-term | 7 | 29.2 | 17 | 70.8 |
| Birth weight |
| Normal (≥2,500 g) | 50 | 32.5 | 104 | 67.5 | 0.829 |
| Underweight (<2,500 g) | 9 | 34.6 | 17 | 65.4 |
| Infant abnormality at birth |
| No | 55 | 32.9 | 112 | 67.1 | 0.873 |
| Yes | 4 | 30.8 | 9 | 69.2 |
| Infant illness during the first 12 months |
| Febricity (yes/no) | 19 | 34.5 | 36 | 65.5 | 0.738 |
| Respiratory illness (yes/no) | 23 | 29.9 | 54 | 70.1 | 0.473 |
| Gastrointestinal infection (yes/no) | 13 | 39.4 | 20 | 60.6 | 0.372 |
| Hospitalization frequency |
| Never | 23 | 25.0 | 69 | 75.0 | 0.038* |
| Once | 20 | 36.4 | 35 | 63.6 |
| ≥Twice | 16 | 48.5 | 17 | 51.5 |
| Daily prolonged infant crying (over 15 minutes per time) frequency |
| Sorely | 8 | 15.4 | 44 | 84.6 | 0.004* |
| Occasionally | 11 | 50.0 | 11 | 50.0 |
| Regularly | 66 | 62.3 | 40 | 60.3 |
| Maternal worries regarding infant health |
| Sorely | 15 | 22.7 | 51 | 77.3 | <0.001* |
| Occasionally | 13 | 21.7 | 47 | 78.3 |
| Regularly | 31 | 57.4 | 23 | 42.6 |