Final answer:
A pediatrician may suspect Fetal Alcohol Syndrome (FAS) in two-year-old Peter based on the described facial features and physical characteristics. FAS is connected to prenatal alcohol exposure and could present with the mentioned symptoms. Diagnostic tests are required for an accurate assessment.
Step-by-step explanation:
Fetal Alcohol Syndrome Diagnosis
Based on the physical features described, such as short eye openings, a flat midface, an indistinct ridge under the nose, and a thin upper lip, the pediatrician might suspect Fetal Alcohol Syndrome (FAS), rather than Williams syndrome. FAS is associated with prenatal alcohol exposure and can include symptoms like below-average head circumference, smaller than average eye openings, skin folds at the corners of eyes, low nasal bridge, short nose, and a thin upper lip with an indistinct philtrum. These facial characteristics can also be accompanied by developmental delays and other abnormalities.
While genetic testing can confirm conditions like Prader-Willi Syndrome (PWS) and cri-du-chat syndrome, the physical features and behavioral indications mentioned in cri-du-chat, such as a distinctive high-pitched cry in infants, do not seem to align with the symptoms of two-year-old Peter. Considering the symptoms observed, particularly the distinctive facial features, FAS could be the likely diagnosis. Moreover, Figure 22.6.6 illustrates similar features associated with children with FAS. It is essential to note that proper diagnostic procedures including genetic testing and further clinical evaluation by medical professionals are necessary for an accurate diagnosis.