I have had does with quads raise all 4 without a bit of intervention, and then others with trips reject one and even had one who had twins and said, "Nope!" to one. So, as everyone said, just be prepared. If she has 3 (or more) chances are one may be a bit smaller and not have as much get up and go as the others at first, but don't jump right in to intervene. Even if you have to hold the smallest one at mom's teat to nurse a time or two, try to let nature do its thing before taking over. And be sure that if you DO end up supplementing or bottle feeding, that all the kids get mom's colostrum the first couple days.
Also, older does tend to be larger than first timers, even with only 1 or 2 kids, as all that "stuff" inside has been stretched a time or two. (Just like us!)

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Kokiri Kikos
Naturally Raised PC, PB, & NZ Kikos
http://kokiri.kikos.googlepages.com/
