This study investigates early childhood educators' language training competence that is required to support children's linguistic development. Hundred and forty-four early-years-professionals in Germany completed a computer-based assessment. We first tested knowledge of linguistic topics (e.g. morpho-syntax, developmental stages). Second, we probed their ability to make relevant linguistic observations in videotaped child-educator interactions. Third, we asked them to select adequate language interventions for the observed child. The participants' knowledge and observing ability scores were slightly above 50% but they scored low in selecting effective interventions. More detailed analyses indicate that those with a higher level of secondary education outperformed low-educated early-years-professionals. Only those with intensive specialist training were better equipped to choose appropriate intervention methods. We discuss the results in light of the current German and (inter-) national practice of early childhood educators' professional training and suggest a greater emphasis on linguistics and language awareness in their education. (author abstract)