You're going to have losses. You're going to have to give stuff up. You're going to have far less free time than you're used to, and less money, and more responsibility, and far more noise. It's not going to be fun. What you give up is real.

They're going to smile at you, and run to you for hugs. Don't miss that because you're looking at what you had to give up.

Especially, don't be desperately trying to keep some free time in your life, and some mental space in your head, and avoid giving them your time and attention. Giving them time and attention is where the payback for the losses comes. (It's also your job now.) Don't short-change them. If you do, you're also short-changing yourself - missing the gains by trying to minimize the losses.