Today, 09:53 AM
Here are a few tipsheets with information about safe bedsharing: http://www.llli.org/sweetsleepbook/tearsheets
Pooping once a day is definitely not enough to be convinced of adequate intake. It may be ok but it may not. More typical at this age would be 3-5 poops a day or more. But also, size matters. For instance, One humongous poop a day would probably be more indicative of ok milk intake than 3 skid marks a day.
But if baby is only pooping once a day, until you are sure all is well, it does make sense to weigh more often, although not too often. Daily is probably too much, maybe once or at most, twice a week would be ok? Remember you want to be looking at the big picture of overall gain from lowest known weight. And accuracy of the scale is vital.
This is a helpful article about what to expect in the early weeks. http://kellymom.com/bf/normal/newborn-nursing/