I have seen what seems to be a butter like substance adhere to the inside of
bottles and especially bags used to deliver ebm, when the milk was shaken not
swirled to get the fat (i like it to heavy whipping cream) back into
suspension.  It  seems to happen more often after the milk has been frozen in
"cheaper" disposable bottle bags that have been frozen over a week or so.  I
get the point across to moms by explaining how you have to be very gentle when
making real whip cream or you get watery butter, not the smooth great tasting
product you are expecting.

On medrol dose pack (steroid) use.  The major concern about steroids is
adrenal suppresion in the person taking it long term (not usually, just a
week), that is why the dose pack is set up in a higher dose to start and is
tapered off over the week.

It would seem that the same protection would be provided to the baby with no
need to pump and dump.  Short term steroid use is not in MOST cases (unless
the baby has some other major underlying disorder-- very rare)  reasons to
pump and dump are few and far between.

Just my 2 cents worth

Anne F. Norton-Krawciw, RPh, IBCLC
Pharmacist / Lactation Consultant
Breastfeeding Specialists Inc
Sterling Heights MI USA