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Amsterdam Transportation-OV Disposable day pass for kids

Hi everyone,
We will be in Amsterdam in May for 4 nights/5 days and are travelling with a 4 year old.
During that time frame we are thinking of using the disposable day passes(24 hr/48 hour etc) to travel around Amsterdam. Since we have a 4 year old, is there a discount for toddlers using the day pass or do we need to pay full fare? I know 3 years and younger is free but am unable to find any information in english for 4 year old discounts. Additionally the GVB website with english translation does not work for information on this.
Thanks in advance.