Visual or hearing challenges
Pelvic inadequacy or misshape
Uterine incompetency, position, or structure
Secondary major illness (heart disease, diabetes mellitus, kidney disease, hypertension, chronic infection such as tuberculosis, hemopoietic or blood disorder, malignancy)
Poor gynecologic or obstetric history
History of previous poor pregnancy outcome (miscarriage, stillbirth, intrauterine fetal death)
History of child with congenital anomalies
Obesity (BMI >30)
Underweight (BMI <18.5)
Pelvic inflammatory disease