Final answer:
The information suggests that low birth weight is a significant characteristic of babies born to unwed mothers, attributed to factors like maternal undernutrition and intrauterine growth restriction.
Step-by-step explanation:
The question touches on the characteristics of babies born to unwed mothers. It investigates birth outcomes such as gender and birth weight. Given the information provided, low birth weight is a characteristic that has been actively studied and is known to be influenced by a variety of factors, including maternal nutrition, length of gestation, and overall parental health.
More specifically, low birth weight is defined as a birth weight lower than 2.5 kg (5.5 lbs). Although the sex of the infant (male or female) may be distributed somewhat evenly, concerns such as low birth weight arise from issues such as preterm birth, undernutrition, or inadequate fetal growth, which can affect newborns regardless of whether their mothers are wed or unwed.
Studies indicate that environmental and maternal health factors significantly impact birth weight. For instance, maternal undernutrition and intrauterine growth restriction are notable causes of low birth weight. Therefore, the more accurate answer regarding the characteristics of infants born to unwed mothers, based on the provided references, would be: c) Have low birth weight.