Kevin Federline has learned that co-parenting with your ex means making sacrifices.
The 39-year-old father-of-six -- including 11-year-old Sean and 10-year-old Jayden with Britney Spears -- opens up in a new interview about what raising kids with a pop star ex is like, and how splitting the time causes him to miss out on certain things, such as Father's Day.
"I’m used to not having all my kids, and this is gonna be one of those years," Federline tells Bravo's Personal Space. "When you are co-parenting, you have to be willing to give up some of the things you would really like to do. My boys will be gone, their mom’s off in Asia on tour. They are with me until the 15th, and then they are gone for the rest of the month. So I won’t have the boys for Father’s Day."
WATCH: Kevin Federline Talks 'Overwhelming' Marriage to Britney Spears, Opens Up About Their Divorce
Federline admits that while co-parenting was tough at first, with practice, it's become routine.
"You fall into your routine and it’s really easy now," he explains. "It wasn't always easy, but it’s a lot easier now."
MORE: Kevin Federline Shares Adorable Snapshot of His Six Children All Together: 'They're Getting So Big!'
And six kids in, Federline has turned into a sort of fatherhood expert.
"Having six, it feels like you're trying to control a basketball team. But it’s worth it," he says. "By the time you have six, you are so well seasoned. I can probably change a diaper with one hand and feed a kid at the same time."
One thing the professional dancer is able to provide his kids when he does have them, is structure.
WATCH: Kevin Federline Celebrates Son Sean Preston's New Braces With Beaming Pic: 'Lookin' Like a Champ!'
"Up at 6/6:30 a.m. Get the kids ready, take them to school. Kids get home, homework done, dinner, showers, off to bed," he shares. "I try to be in bed by midnight. If you aren't getting 5 to 6 hours of sleep, you’re falling asleep while they're at school."
Watch the video below for Spears' sweet Instagram video with her son.