Watch Below: Kim Kardashian's noisy kids interrupt Jimmy Fallon interview"Every year I write each one of my kids about a four or five-page letter on their birthday, about what the year was like, who their friends are, silly words they're saying, their favourite foods, all the silly things they do and a little journey of what the year is like," Kim revealed in the latest episode of the On Purpose with Jay Shetty podcast. "It's so fun to see from the first year now," she continued, "one of them is almost 10 years old. And I know that they'll appreciate this." During the interview, Kim also touched on the realities of raising four children and the mix of good and bad days - especially as she and ex-husband Kanye West navigate co-parenting."Everyone says the days are long and the years are short, and that couldn't be like a more true statement," she explained.