Final answer:
A baby with prune-belly syndrome will have absent abdominal muscles, leading to a wrinkled appearance of the abdominal skin.
Step-by-step explanation:
With prune-belly syndrome, the baby will have absent abdominal muscles. This rare condition is characterized by a lack of development in the abdominal muscles, which can cause the skin of the belly area to wrinkle like a prune. This syndrome may also present with other symptoms such as urogenital abnormalities and problems with the urinary system due to the related muscles and tissues being affected.