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“Introduction

In Sweden, the maternal age in both primi- and multipara mothers has steadily increased during the last three decades. In this period, the mean age of mothers giving birth, both primi- and multipara included, increased from 26.0 to 30.3 years of age. For primiparous women only, the age has increased from 23.8 to 28.4 years of age during the same period. In urban areas in Sweden, the age of mothers giving birth to their first born increased even more, from 24.8 years in 1973 to 30.1 years in 2005 [1]. It has been previously reported that advancing maternal age increases the risk of fetal death [2, 3], but also of other morbidities in the offspring, such as chromosome abnormalities and childhood cancers like leukemia and retinoblastoma [4, 5]. The maternal age has also been associated with the development of diabetes mellitus type 1 and schizophrenia in the offspring, but these associations were also found to be dependent on paternal age [6, 7].