Which initiative is a primary strategy to prevent lead toxicity?

During the shift assessment of the healthy, full-term neonate born 24 hours ago to the 25-year-old G1P1 mother who had an uncomplicated pregnancy and delivery, the nurse notes the urethral meatus is on the ventral part of the penile shaft. The assessment is also notable for wide-spaced, downward-slanting eyes that resemble the baby’s father. The baby is pink, well-perfused, and breathing comfortably with normal heart and lung sounds. The mother reports the child is breastfeeding every 2 hours and has voided and stooled several times. Which additional assessment is most important? 

A 14-year-old patient presents to the clinic complaining of right outer ear pain. Which characteristic most likely explains the cause of the pain?