Photographing children and pets is always challenging. Try carrying a whistle or other attention getting device to stop (or slow) the action.
Read your manual, maybe read it again and keep it handy. Get comfortable with your camera before that “special moment” arrives. Today’s cameras are too complex to “know it all”. Practice – practice – practice.
Give yourself a photographic assignment. Whether it is about local food, music or dress, see if you can make an interesting story.