Thank you for your query,
In the initial weeks of life the stools will be somewhat loose and frequent and usually after each feed and it is due to a normal reflex called gastrocoloic reflex.
But exclusive breastfeeding
is the best method of feeding for your baby till the age of 6 months as it protects against infections and the digestion will be good.
If the loose motions are continuing you can add oral probiotic
like lactobaciilus sachet after consulting your doctor.
If the formula feed is unavoidable, make sure the proper hygienic preparation and accurate reconstitution of feeds and feeding technique should be followed.
Hope I have answered your query.