Inclusion Criteria:  The cognitive level of the mother is sufficient to understand and answer the questions,  Having a single pregnancy, Mother's ability to read, write and understand Turkish The time of delivery is in the range of 37 <GH <42 weeks Not having a chronic disease of the mother (Diabetes, hypertension, hypothyroidism etc.) Vaginal delivery The mother's not using antibiotic derivative drugs during pregnancy Getting 10 points below the Beck Depression Scale Absence of prematurity, Introuterine Growth Retardation (IUGR) or genetic disease in the newborn Birth weight in the range of 2500-4000 gr Absence of a gastrointestinal disease in the newborn Feeding more than 50% of the baby with breast milk Absence of Premature Membrane Rupture (PROM) for more than 24 hours at birth  Exclusion Criteria:  Expressing breast milk or having problems with the breast, The mother's use of probiotics before randomization and during pregnancy, The inclusion of sampled mothers in other clinical studies at the same time.