I wouldn't worry about it -- they will drink when they are ready. I do know from my personal experience and other nursing moms that their nursing babies never used sippy cups at all -- they went straight to open cups or straw cups. In our case, my daughter got interested in my cup, which was often a sports water bottle, or regular adult drinking glass. It may be that sippy cups don't make sense to breastfed babies -- they are used to sucking to get their liquid. I can't remember when she began drinking regularly out of a cup as opposed to just playing, but it was probably around 12 months.
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I don't know why that is on the checklist, but it may be more directed to bottle babies, to be sure they are on track to transition from bottle to cup. Of course, drinking from a cup is a great skill -- but your baby will do it when ready.
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Good luck!
BabygirlsmamaÂ