Do not count
Do not count the number of pictures you will take. The saying “practice makes perfect” is true for your favorite professional photographer and it is also true for you! It is normal to miss hundreds of photos before taking many good ones. Take many pictures and be your own judge.
Take a lot of pictures of your children. I have a lot of photographs from my own childhood and I can tell you that it is the best legacy you can give them: the memory of wonderful moments spent with you.