Correction to: Nature Medicine https://doi.org/10.1038/s41591-018-0102-y, published online 09 July 2018.

In the version of this article originally published, the bars in the mean temperature graph in Fig. 1a were incorrectly aligned. The left-most bar should have been aligned with the Apr label on the projected month of conception axis. The error has been corrected in the print, PDF and HTML versions of this article.

Fig. 1
figure 1

Original and Corrected.