Q. A 1-year-old girl is brought to the pediatrician by her parents who are concerned about her developmental progress. They mention she seems slower in achieving milestones compared to her elder sister. Upon examination, the pediatrician notes frontal bossing, an elongated skull, a flattened nasal bridge, a broad nasal tip, thickened gingiva, anteverted nostrils, and spaced and protruded eyes. The parents also mention that she has had a constant nasal discharge. Additionally, the child has signs of airway obstruction and hepatosplenomegaly. Her parents report aggressive behavior and hyperactivity. Notably, an ophthalmological examination does not show any abnormalities. What is the diagnosis?