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A dataset of ultrasound and audio recorded with children with speech sound disorders. The Ultrax 2020 dataset is a collection of ultrasound tongue imaging and audio data, gathered from children with speech sound disorders by speech and language therapists in hospital environments. We recorded data with 43 English-speaking children, but only 37 gave consent to share their data. These are 11 female speakers and 26 male, aged 5-12 years.