Contemporary Pediatrics Puzzler

Nervous teenager’s hands turn blueThe father of a healthy 15-year-old girl brings her to the emergency department (ED) for evaluation of blue hands.
Delayed menarche with normal pubertal growthA 14-year-old female presents for a wellness visit. On history, she is noted to not have started her menstrual cycle but on physical exam has significant breast and pubic hair development since the age of 10 years.
Boy with ear pain and facial weaknessA 13-year-old boy with poorly controlled type 1 diabetes (T1D) presents to the emergency department (ED) for evaluation of left ear pain and left facial weakness.
Erythema and ecchymosis after newborn’s phototherapyA male infant is born and delivery is remarkable for yellow amniotic fluid and a jaundiced infant. Following delivery he is given intensive phototherapy and then develops erythema, which later becomes ecchymosis. What's the diagnosis?
Infant with failure to thrive and hypotoniaA 4-month-old girl arrives at the clinic for a well-child visit. Her mother voices concerns about the infant’s poor weight gain, slow feeding habits, and physical delays such as head lag, poor grasp reflex, and rolling over.
Tight, shiny membrane encases newborn’s skinAfter a cesarean delivery at 30 weeks, a 1430-gram premature female neonate was noted to have generalized thick, dark brown scale forming a tight membrane over her entire skin surface. Her mother was a healthy 19-year-old gravida 1 with normal prenatal screening ultrasound and laboratory studies. Family history did not reveal any congenital malformations or genetic disorders.
Small-for-age toddler is unable to walkA 22-month-old African American boy born at 38 weeks by normal vaginal delivery presents to a local hospital from a private pediatric office for failure to thrive. He was seen by his pediatrician until aged 1 month but was lost to follow-up. His delay in walking prompted his mother to reestablish care at age 22 months.
Newborn with persistent hypoglycemiaA full-term male infant was born to a 33-year-old gravida 3, para 3 mother. The prenatal course was uncomplicated, without gestational diabetes; the mother received prenatal care at an out-of-state institution. At the delivery, however, the baby was notably macrosomic, with shoulder dystocia and perinatal distress requiring positive pressure ventilation.
Infant with facial lesions and respiratory distressA 2-month-old Hispanic girl is transferred by her pediatrician to the emergency department (ED) for evaluation of decreased oral intake, failure to thrive, and large bleeding facial hemangiomas.
Treat plays trick on a 3-year-old boyA 3-year-old boy presents to the emergency department (ED) with a 1-day history of irritability and listlessness. According to his parents, he was well until the night before when he began to behave abnormally, becoming excessively tired approximately 2 hours after eating dinner. During the night, the boy slept poorly, sporadically awakening with crying followed by brief periods of calmness. The morning of presentation, he was difficult to arouse with intermittent fussiness and reluctance to ambulate.