Identifying environmental causes of developmental delays can include factors such as:

Fetal alcohol syndrome is indeed an environmental cause of developmental delays and is associated with prenatal exposure to alcohol. This condition results in a range of physical, behavioral, and cognitive challenges that can severely impact a child's development. Identifying fetal alcohol syndrome as a cause highlights the significant role that environmental factors, particularly those related to maternal health and behavior during pregnancy, can play in a child's developmental outcomes. Such recognition allows for timely interventions and support to mitigate the impact of these environmental influences on a child's growth and learning.

The other options describe factors that may influence development in different ways. Genetic predispositions relate more to hereditary elements rather than environmental factors, whereas unsupportive parenting styles and dietary habits may not have a direct, identifiable relationship to developmental delays in the same clear-cut manner as fetal alcohol syndrome does.