Melissa: there is a good study which will at least partially answer 
your needs here:

Ambulatory Child Health (2001) 7: 23-26.

The title and authors:

Normal bowel habit during the first 6 weeks in healthy, term infants
Anna Griffin and R Mark Beattie


I am not sure if it is available on line.

Heather Welford Neil
NCT bfc, tutor, Newcastle upon Tyne UK

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