Pumped Milk

[ralph.lasry]

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Pumping on Shabbat

I’ve been told by a few women now that if you’re pumping on Shabbat or Yom Tov you need to pump and dump. Does this apply to milk that is to be used on Shabbat or Yom Tov? or only milk that’s going to be saved for later? does the age of the baby make a difference?