The breast lump in the nursing toddler is NOT related to breastfeeding.  It
is most likely a small amount of breast tissue development and is quite
common, regardless of feeding.  If there are no other signs of premature
menarche (i.e., pubic hair, etc.), one could probably safely just observe the
lump for several weeks.  Generally, they enlarge somewhat, remain static,
then involute spontaneously and don't reappear until the normal age of
puberty.  Occasionally, a little girl will have palpable but non progressive
breast tissue that just stays until puberty when normal development occurs.
If there are other signs of premature menarche, then an evaluation of the
child's hormonal status is indicated.  In either case, the breastfeeding is
not at fault and weaning is unnecessary.  Sounds like the pediatrician needs
to update him/herself about normal breastfeeding duration and the physiology
of breast development.
Linda L. Shaw MD FAAP

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