It's become a little game I have with myself every time I'm added to a kids party WhatsApp group - counting the number of mums who use this phrase - it seems to be the stock response! Once I saw 8/9 replies in a row that were this exact text with only the child's name swapped out!
First I refused to conform and always wrote something more imaginative... now I like to join in and see how many repeats we can get!