During an examination of a 3-month-old, the NP places the in…

During an examination of a 3-month-old, the NP places the infant in the supine position with the hips flexed 90 degrees and abducted while holding the legs by the thigh and gently adducting the leg while applying downward, lateral pressure. What is the name of the supplementary exam commonly performed in conjunction with the exam described? 

A young couple brings their newborn in for evaluation of dar…

A young couple brings their newborn in for evaluation of dark spots above the diaper line on the infant’s lower back.  On exam, the spots are hyper pigmented and non-raised. Dad relates he had the same thing as a baby, and they gradually went away.  What is the most reasonable explanation for this presentation?