Short-term auditory memory (working memory) helps us understand language. We use this memory to hold, process and assimilate the spoken language. It influences the speed at which children learn new words and learn to read. Generally, long-term memory is not impaired, and neither is visual memory, which is often far stronger—difficulties with generalisations, thinking and reasoning.
Concentration is sometimes an issue. Children with Down syndrome are rarely lazy but often tire easily due to the pressure of work and effort required, lack of understanding of the task involved, the time of day, the amount of work already completed, lack of sleep or poor quality of sleep (maybe sleep apnoea) or other medical issues like thyroid, ear infections, chest infections or colds.