High chair age range

Hi,


Im looking for a bit of guidance for age ranges for high chairs. I’ve searched previous forums which says ‘up to aged 2’, but can’t find anything on the age babies will need a high chair from!
I was assuming any babies over a year, but I don’t have kids so i’m a bit clueless. For example, we have two 8 month olds and a 6 month old coming, would their parents expect one?
Id rather not ask the guests because we may be short on space depending on RSVPs so would like the option of the younger sitting on laps if it’s an absolute must!
Thanks