When Jovie & I were having heaps of problems with breast refusal, it all started when I had a huge whack of antibiotics. Then the LC I went to suggested we give probiotics to Jovie at 9 weeks, at every formula feed we did. She suggested I continue that until Jovie was 12 months. She didn't give me any medical information other than that it would reduce wind and upset tums for Jovie and help her develop a good gut flora.

HTH!