When faced with a young (under 6 weeks) baby who isn't stooling, rule out
"not getting enough food" first.  It's the most straightforward answer.
Confirm food intake with several methods including pre-and post-feed weights,
weights several days in a row, etc. Don't rely on subjective measures - weigh
the baby.

Once you've proved that the baby IS taking in enough milk, then ask where is
it going if there's no poop? For an older BF baby, they can save it up for a
week or more, and when it comes out it's normal in consistency and there's a
lot of it.

Linda Smith, believer that what comes out must have gone in. Be sure
something went in before you try to find out why it didn't come out. Private
LC practice, Dayton OH