Children born after assisted reproduction more commonly carry a mitochondrial genotype associating with low birthweight.

Furthermore, haplogroup T, which has been associated with obesity 45 , 50 , showed a trend to being under-represented in individuals under the 10th and 25th birthweight percentile ( p = 0.094 and p = 0.04, respectively, however, these values are not significant after Bonferroni correction for multiple testing, Fig. 2a , b and Supplementary Tables 8 and S9 ).

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