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Multi day fare Brussels Transportation card

We will be in Brussels for 3 nights and will be getting the 24 hour or 48 hour "Discover Brussels" fare cards for using public transportation.
I've looked on the STIB website before and could have sworn that children 4 and under are free but now I am unable to find that anywhere on their site (We will be travelling with a 4 year old). Does anyone know if this is indeed true? I do not see fares for children listed anywhere on that site so I am not even sure if there are discounts for fares for kids.
Thanks in advance.