Nylund A, et al. - Researchers explored the links between recurrent respiratory tract infections (RTI) or acute otitis media (AOM) during the initial one and two years of life and vocabulary size at 13 and 24 months of age by analyzing data of 646 children born between January 2008 and April 2010 and followed up from birth to two years of age with daily diary and study clinic visits during RTIs and AOM. As compared to children without recurrent RTIs or AOM, children with high rates of RTIs or AOM did not have smaller vocabularies. They found that girls had larger vocabularies and higher parental socioeconomic status was related to a larger expressive vocabulary at 24 months. As compared to a high burden of RTIs or AOM, the child's gender and parental socioeconomic status played a more critical role in vocabulary development in the initial two years.