How long is a piece of string? I don’t have children, but I work with them. I hear all about their hobbies, what they get up to in holidays and at weekends and they tell me about gifts.
Some children have a fortune spent on them at Christmas and very little throughout the rest of the year (including access to clubs, holidays, etc).
Some children have everything; holidays, experiences, activities, gifts all year, lots at Christmas.
Some children get things throughout the year when they need them (bikes, clubs, clothes) but less at Christmas.
Some children don’t celebrate Christmas at all.
Some children have literally nothing, all year, ever.
Just do what you think is appropriate and within your budget.