This website says:
Quote:
Your best option is to ask your occupational therapist for a recommendation. If that is not an option, we recommend using the following formula: For a small blanket take 10% of their body weight plus one pound. For a medium blanket take 10% of their body weight plus two pounds. For an adult-length blanket take 10% of their body weight plus three pounds. These recommended weights are shown as you make your weight selection.
This website has a chart.
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