Anita--

This is quite possibly a developmental thing rather than breastfeeding
related.  By that I mean that at about this age many infants who have
seemed to have slept through the night begin calling out to the parents
that they know are out there somewhere.

Why is that?  They have recently developed object permanence and want to
be sure momma or daddy is still there.  This is also the time when they
develop stranger anxiety and protest when someone with whom they are not
really familiar approaches and is overly friendly.  Nursing is probably
the baby's favorite comforting measure and if she is expected to sleep
in a crib by herself and wait until someone comes in response to her
cries, may require longer periods of comfort than if she was in the
parent's bed.  (gasp from someone, Family Bed, oh no!)

For some infants this will last one to two weeks, for others it may take
a month or so to resolve.  Just remind parents that this is a sign of
continued growth and development, not a sign of regression or inadequate
milk supply.

It might also be contributed to by the weaning from phenobarb, but I
would really be more inclined to see it as developmental.  I hear
complaints about this type of behavior even from the ABM feeding moms
that I work with.