You could direct your colleague to The Breastfeeding Atlas 4th Edition, Wilson-Clay and Hoover, pages 43-45. If the baby cannot get his mouth around and beyond the teat portion of the shield, he cannot get a good latch.
I tend to be a little doctrinaire in the other direction. I think the 24mm shields should be locked up unless that is the only size that will fit around the mother's nipple.
Susan Nelson, IBCLC
Austin Texas
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