Inclusion criteria: Mothers interest to exclusive breastfeeding, mothers interest to pumping breast, have minimum 18 years old, have normal body mass index, present of mother in hospital, preterm infant with gestational age less than 32 weeks, Infant hospitalization in NICU fed with NG tube; Criteria for non-entry: Use of cigarette, alcohol and drugs, use of any galactogogue and complementary drug, affliction of mother to infectious transferable diseases from lactating such as HIV and active pulmonary Tuberculosis, history of infertility, diabetic mother, mother use of anticoagulation, mothers with cancer related to estrogen, Taking psychiatric drugs, performance of breast surgery, Breast problems such as abscesses, inverted nipples, mastitis or cancer,Premature birth defects such as cleft palate and cleft lip, Supplementation by the infant, Twin or multiple infants.