Final answer:
An article comparing breastfeeding and formula feeding on infant growth would likely be authored by a developmental psychologist, focusing on how physical and psychosocial development is impacted through nutrition during infancy.
Step-by-step explanation:
If an article compares the value of breastfeeding versus formula feeding on the physical growth of infants, it is likely that the psychologist who wrote this article specializes in the field of developmental psychology rather than social psychology. Developmental psychologists focus on the different stages of human growth from infancy through late adulthood, including how our physical, cognitive, and psychosocial skills develop. The article might explore critical components of healthy development, such as the formation of attachment in infancy and the effects of parenting styles on well-being. In addition, such an article might discuss psychosocial development, which encompasses social and emotional growth, importantly the development of healthy attachments and how neglect can affect these bonds.
Investigating the comparison between breastfeeding and formula feeding ties into a developmental psychologist's
interest in patterns of growth, hormonal regulation during lactation, as well as the nutritional and immunological benefits that breast milk provides. This area of study reflects upon biological processes, such as the increase in milk production through positive feedback due to suckling and how this process contributes to an infant's development. The evolutionary implications, genetic factors, and psychosocial outcomes are all well within a developmental psychologist's realm of research.