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The version of me that was barely out of toddlerhood was probably thrilled to find out Chewbacca had a kid my age, in the same way adult me noticed many years later with both hilarity and horror that Chewie’s dad Itchy looks like a genital wart.

"We found an association between cold and heat exposure during pregnancy, infancy and toddlerhood and global MD in children aged 9–12 years," the authors write.

The researchers identified multiple genetic factors underlying vocabulary size in infancy and toddlerhood.

According to St Pourcain, "Genetic influences underlying vocabulary size rapidly change across less than two years during infancy and toddlerhood. Adopting a developmental perspective, our findings provide a better understanding of early speech- and language-related aetiological processes in health and disorder."

First author Ellen Verhoef adds: "This research indicates the relevance of vocabulary size assessed during the first few years in life for future behaviour and cognition, emphasising the need for more data collection efforts during infancy and toddlerhood."