Inclusion criteria
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① Primipara;
② The gestational age at delivery is 28-36 + 6 weeks. Premature infants are singleton and sent to NICU immediately after delivery;
③ Postpartum vital signs were stable;
④ Those who are willing to breastfeed;
⑤ Be aware, understand and complete the questionnaire;
⑥ Informed consent, voluntarily participate in this study and sign the informed consent form.
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Exclusion criteria:
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① Contraindications to breastfeeding (for example, the mother is using certain drugs, temporarily unable to breastfeed, HIV infection, human T-lymphocytic virus infection, drug abuse);
② Minor mother (under the age of 18);
③ The mother may have insufficient lactation due to some pathological factors, such as breast dysplasia, breast surgery history, breast augmentation, breast reduction, hypothyroidism, hypophysis, polycystic ovary syndrome, ovarian luteinized cyst, placental implantation, postpartum hemorrhage diagnosed immediately after operation, and amniotic fluid embolism; Pregnancy complicated with type I diabetes, severe anemia during pregnancy. Pregnancy complicated with severe hypertension, heart disease and immune system diseases affect postpartum milking and breastfeeding;
④ Smoking or passive smoking during pregnancy;
⑤ Obesity before pregnancy (BMI > 27kg / m2);
⑥ The subjects used levodopa, estrogen and bromoergotapeptide to affect the level of PRL.
⑦ During the treatment, the condition of premature infants worsened, their lives were in danger, and their families gave up treatment.
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