Bene-bac - how often?

Riley and Xander have been having some soft stools due to some recent food changes I believe. I have a tube of bene-bac which has 15 1g doses. It has instructions for newborns but that's it.

How often should they have this? Just once? Weekly? Monthly?

I am not familiar with the benebac doses, but with probios, when making a food change, I gave once a day during the transition, and for a a few days up to a week after the full transition has been made.

I give Bugsy daily, 1/4 tsp per meal (powder), because he has digestive problems... for food changes:

1 gram per each 10lbs of body weigh on days 1,3,5 and 7 - so, basically for a week, every other day...
I forgot - for maintenance - one gram a week