The colors vary a lot. We're still getting at least 2 poopy diapers every 24-hour period, one of which is a diaper-filling blow-out. Yesterday we had 4.
DD had soiled diapers at almost every change until about 6 weeks, then she changed to about 1-2 per day (but every once in a while she'll go a full day with only wet diapers.) Around the same time they changed from always being mustard-y yellow and now they can be anything from yellow to brownish to green.
Our doc told us to only be concerned if it drastically changed. For us pooping multiple times per day would have been a drastic change because she's an every 5-7 day kinda gal. The color and consistency were also consistent until we started solids.
Re: How many poopy diapers...
Sometime around 10 weeks we went from soiled diapers at almost every change, to maybe one a day or one every couple of days.
They are anywhere from yellow to tan to green.
My nascent blog
Same experience in terms of number. Ours are mostly orangeish though sometimes it's more yellowy.