I cannot create an abstract for the article "Growing pains" from the journal Science, Volume 391, Number 6782, January 2026, because this article is not included in the search results provided. Search results include articles on other health topics, such as shortness of breath, health problems in pregnancy, or medical implants, but not on growing pains. In order to create an accurate and factual summary as per your requirements, I would need access to the full text of this particular article.