Yes, sub-q can be done with smaller needles, keep in mind that the smaller the needle, the LONGER it will take to get the same amount of fluids in, if you go too small, you may have to sit there and squeeze the bag the entire time (and it could take 30 minutes of longer). There has been some studies done that suggest that keeping the needles refrigerated or frozen before use lessens the pain. Start by going one size smaller, and go down until she seems to accept it better, but stay as large as you can to keep the flow moving quickly.
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