A 4-month-old female infant has been gaining weight well and achieving normal milestones. She was a full-term infant born via vaginal delivery without complication. Her past medical history is significant only for a mild URI the previous month, and she is current with her vaccines. She has been exclusively breastfed since birth. Her mother eats a well-rounded diet that includes meat and dairy.
What supplementation does the infant require?
A) Vitamin A
B) Vitamin C
C) Vitamin D
D) Vitamin E
E) Vitamin K
