Supplementing with a cup?

[Zoethink]

I am curious if there are any mamas here who have experience supplementing with a cup. I had severe supply issues with DS along with a lot of other issues, and he was on a bottle from birth. We also nursed for four months, but even with pumping I never made much milk for him.

If I have another LO I would like to be as prepared as possible to make Bfing successful even if I have a low supply again, which we are not sure will happen.

I was wondering when you started using the cup, and whether it is a really efficient way to feed. Did your LOs spill a lot? If so, how did you measure how much they were getting? Or, did you just go by their cues to tell whether they were done eating? I am not sure what other questions to ask, but if there is anything else you want to share, my ears are open!

Thanks!