In a message dated 10/08/1999 5:03:06 PM Central Daylight Time, writes: << Since thrush is so hard to eradicate, is there any proven harm to letting the baby have it until he is weaned. >> If it is asymptomatic in both mother and infant (in that case, how would you know??) then probably not. But I suspect some babies are in discomfort with oral candidiasis, and I KNOW many mothers are in excruciating pain -- burning pain -- with their nipples. Babies may not eat as well -- it may present as an intractable diaper rash which isn't comfortable. Yup, I think treatment is in order. Jan -- IBCLC Wheaton, IL