AIM: To verify the hypothesis that even if breastfeeding is continued during pregnancy, there are no harmful effects on pregnancy. METHODS: The outcomes of pregnancies in mothers who continued breastfeeding during pregnancy were studied. One hundred and ten pregnant women were recruited who had one full-term baby, no experience of premature birth or abortion, and who continued to breastfeed at diagnosis of pregnancy. Age and pregnancy history matched 774 pregnant women were selected as a control group. All of the control women stopped breastfeeding at least 3 months before becoming pregnant. We reviewed the outcome of each pregnancy retrospectively from patient records. Statistical analysis was conducted using the chi(2) test. RESULTS: Eight of 110 pregnancies (7.3%) resulted in spontaneous abortion in the breastfeeding group, and 65 of 774 pregnancies (8.4%) in the control group. There were no statistically significant differences between the two groups (P > 0.05). CONCLUSION: Even if the mother is pregnant, breastfeeding should be continued until natural weaning occurs. Further study is required to conclude safety of breastfeeding and premature birth.
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