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In multiple studies, interpregnancy intervals <18 months have been associated with higher rates of preterm birth and small-for-gestational-age (SGA) neonates. Australian investigators examined national registry data to examine whether the association persisted among women with three successive live births (in this within-mother study, each woman served as her own control).
After matching two birth intervals per mother, the results showed that interpregnancy interval had little effect on risk for preterm birth, SGA, or low-birth-weight infants.