Final answer:
Grade 3 inverted nipples involve prolactin levels, oversupply issues, and engorgement.
Step-by-step explanation:
The concern about Grade 3 inverted nipples involves all of the above factors: prolactin levels, oversupply issues, and engorgement. In Grade 3 inverted nipples, the nipple is retracted inside the areola and does not protrude even with stimulation. Prolactin is the hormone responsible for milk production, and disruptions in its levels can affect the milk supply. Oversupply issues can lead to difficulties in breastfeeding and engorgement, which occurs when the breasts become overly full with milk.
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