Paediatricsniche
A boy is born at 39 weeks weighing 2.5 kg to a woman with epilepsy who took a single antiepileptic drug throughout the pregnancy. He has a broad flat nasal bridge, widely spaced eyes and a short neck. The terminal segments of his fingers and toes are short and tapered, and the nails on them are small and poorly formed. The spine and back are intact with no midline lesion, the heart sounds are normal and both femoral pulses are strong. Which one of the following drugs did his mother most probably take?