Good to see you got the probiotics going. My son had them from day 3 when we got back from the hospital. I would moisten my finger, put on the powder and gently press it into his mouth while he was nursing. We HAD to have them as my wife had a C-section, due to my son's enormous head in utero(I am 6'9", my wife is 6'2"--in the "State of Nature" we would have been "selected out") and his clean gut would have been populated by just about anything rather than the specific bacteria that humans need.
As you probably know the C-section requires the mother to be on antibiotics during recovery--this severely compromises her body's ability to colonize the infant.
We used Jarro and Ethical Nutrients acidophilus and bifidorum. I now culture the two as yogurts, and by the age of 2 1/2 my son has eaten a record of 5 6oz jars in a day-- of his own choosing. His immune system is gangbusters and he has never had any of the afflictions that are listed in the first post of "The Power of Probiotics" thread.
My purpose of this post, however, is to relay info that we have discovered in the course of the last few years. The digestive juices (in the stomach) of pregnant and lactating women are extremely powerful. In getting YOUR probiotic supplements (whether yogurt or powder) into your body it is very difficult for the bacteria to make it through the enhanced stomach acids.
What my wife does now is to take the yogurt whenever she wakes up in the early hours of the morning (between say 1 am and 6 am) when all digestive functions are basically shut down. With a couple of bananas (they have inulin-- a soluble fiber that feed the flora) a large cup of room-temp water (non-tap because of chlorine) and a form of flora, she gets a much better colonization.
Good luck,
Ray