Hi Heather
This has been discussed before. Check the archives.  My understanding is
that while breast stimulation causes the release of oxytocin, until a mother
is ready to go into labour, oxytocin reception will be blocked in the
uterine muscle.  It is perfectly safe for this mother to express under the
shower for comfort - unless she has a history of premature labour.
Cheers
Nina Berry BA/Bed(Hons) Dip Arts(Phil)
Breastfeeding Counsellor
PhD Candidate - "Ethical Issues in the marketing of 'Toddler Milks'"

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