Keitha,
I've worked with one mom who had a bifurcated nipple on one breast. Both
with her firstborn and with the baby I helped her with, that breast
stopped producing and involuted despite frequent nursing.  Mom's milk
came in normally on both sides, but baby acted very frustrated on the
bifurcated side. When we pumped her, almost nothing came out from that
side.....

I concluded that the bifurcated nipple was apparently "defective" and did
not have outlets for the milk. Thus, though she filled with milk and
became engorged, that breast eventually involuted. Mom was very relieved
when I suggested that she stop using that one breast and nurse
exclusively on the other.  Her milk supply was "borderline" and very
finely tuned, but she successfully nursed for over a year, much longer
than with her firstborn, who threw her for a loop. One thing I can tell
you about her one-sided nursing--- I've never seen so many let-downs in a
nursing session, coming so frequently!  The body's ability to adapt is
wonderful.

Chele Marmet has pictures of similar bi- and tri-sected nipples, one of
which she calls a "raspberry nipple", in her book "Charts and Forms".

You'll have to wait and see how this mom does; I'd keep a close eye on
her and not say anything unless problems develop.  Keep us posted!

-Lisa Marasco, BA, IBCLC