RCT 1 Randomized double-blind, placebo-controlled study of 2 groups. Pregnant women (n=159) have been randomized into one of the study groups 2-4 weeks before term to receive placebo (microcrystalline cellulose) or probiotic Lactobacillus rhamnosus GG (ATCC 53103; 1010 cfu). After delivery probiotics/ placebo were administered orally to the infants for 6 months. General information to prevent allergy has been given in written form to all: to breast-feed for at least 4-6 months; to begin solid foods at 4-6 months; no smoking by caretakers.