Introduction: One of the problems that can occur during breastfeeding is hyperlactation, also termed as hypergalactia or oversupply and it means excessive ,milk production in mother's breasts or more than the baby needs which is between 450 and 1200 ml per day. There are many possible reasons for occurence of hyperlactation and the signs show up in both, the mother and the baby. Mothers with breast milk oversupply may report about mastitis, plugged milk ducts, sore nipples and abcsess. Baby can be colicky, bloated, have green stools. They may show either a very low or a very high weight gain. Purpose: To present the problem of hyperlactation in breastfeeding mothers, what are it's causes, signs and symptoms and how to treat it. Methods: A descriptive research approach was used to review the literature breastfeeding and hyperlactation. We reviewed and analyzed literature written in Slovene and English, with freely available full text. We searched the literature using the COBISS, Medline and PubMed databases and Google Scholar, and DiKUL search engine, from January 2020 to December 2020. Results: Many studies show that there are severe different reasons for the occurance of hyperlactation. The most common are large mammary glands, too frequent pumping with purpose to make great quantities of milk or to relieve normal postpartum fullnes, consuming herbs that increase lactation or a fragment of retained placenta. Signs of hyperlactation are seen in both, mother and the baby. Mothers feel tension and pain in the breasts and milk is spraying for no good reason. Breasts remain full and uncomfortable even after feedings. The infant can gain weight either too low or too high, have big foamy, green stools and refuse feeding in every position. The treatment of hyperlactation has not been well studied yet, but one of the most effective known method is block feeding. To help decrese lactation, pseudoendoprhines and some herbs also can be used. Discussion and conclusion: In the literature review, we found that hyperlactation has negative impact on mother and infant. It can affect that much, that they give up on breastfeeding. Despite the consistent findings of different authors, there is still no certain way to prevent or stop hyperlactation. In future, it would be necessary to do recent reserch on the causes and treatment of hyperlactation in Slovenia and elsewhere.
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