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Contraception. 2005 Nov;72(5):346-51. Epub 2005 Jul 6.

A comparative study of the levonorgestrel-releasing intrauterine system Mirena versus the Copper T380A intrauterine device during lactation: breast-feeding performance, infant growth and infant development.

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Department of Obstetrics and Gynecology, Faculty of Medicine, Assiut University, Assiut, Egypt.



Mirena is a levonorgestrel-releasing intrauterine system (LNG-IUS) that provides highly effective and long-acting progestogen-only contraception.


The objective of this study was to analyze the possible effects of using LNG-20 microg IUS on breast-feeding performance, infant growth and infant development during the first postpartum year as compared with the Copper T380A intrauterine device (Cu T380A IUD).


This study is a prospective, controlled and randomized trial.


The study was conducted at the Department of Obstetrics and Gynecology, Assiut University Hospital, Egypt.


Three hundred twenty lactating women asking for initiation of contraception during the early postpartum stage were assigned randomly into two groups, the LNG-20 microg IUS group (n=163) and the Cu T380A group (n=157). The insertions were done 6-8 weeks postpartum. Each participant was followed up at three monthly intervals after insertion and until the first birthday of her baby. During these visits, the breast-feeding pattern was assessed, certain infant physical growth parameters were measured and a set of infant development tests was performed.


No pregnancy occurred in both groups. There were no significant differences in the net continuation rates between the two groups (89.3 for LNG-IUS vs. 90.9 for Cu T380A). The LNG-20 microg IUS group had comparable rates of breast-feeding continuation, complete weaning, full breast-feeding and partial breast-feeding, with the Cu-IUD group. No statistically significant differences were found between groups with regard to all infant physical growth parameters and various infant development tests.


The findings of the current study confirm that the use of LNG-20 microg IUS during the first postpartum year in lactating women provides highly effective and acceptable contraception and does not negatively influence breast-feeding or the growth and development of breast-fed infants.

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