A study led by the University of York in the UK has found that twins experience developmental delays in early childhood compared to their single-born siblings, potentially influencing their long-term learning behaviors. The study, which compared data from 851 twin pairs and their younger singleton siblings, found that they display disadvantages in cognition, language, and social-emotional skills as they approach school age. However, twins seem to surpass their siblings in language skills by the age of 7. The findings suggest that twins could benefit from early support to reduce learning disparities and improve their chances of achieving academic success. The research was published in Child Development Development.