How much £ do you...

Just • 2 girls & baby girl no3 on her way 😘
How much do you/have you spent on your child for xmas gifts? 
I only have one at the moment she is 3, 4 in March and pregnant with another daughter and I always go over the top at xmas time for gifts (this year ive spent about £400 on her) and know next year I'll have 2 to buy for so won't be able to go as crazy and want to budget. 
Do you budget? Spread the cost? Buy throughout the year? How much?