Which of the following is a common symptom of Fetal Alcohol Syndrome (FAS)?

Fetal Alcohol Syndrome (FAS) is a condition that results from alcohol exposure during pregnancy and is characterized by a variety of physical and developmental abnormalities. One of the hallmark symptoms of FAS is poor growth, which can manifest as low birth weight and growth deficiencies during childhood. This symptom typically accompanies decreased muscle tone, leading to difficulties in movement and coordination, making it quite recognizable among the symptoms associated with FAS.

Other options listed, such as excessive perspiration and skin irritations, or frequent illnesses and allergies, are not typical indicators of FAS. These symptoms are commonly associated with various other conditions or congenital syndromes but are not part of the classic FAS symptomatology. Therefore, the association of poor growth and decreased muscle tone is specifically relevant to FAS, substantiating its selection as the correct answer.