Lots of times moms see something cute happening so they snap a picture or two and stop, believing they have captured the moment. While one picture may serve to remind you of a cute memory, it may not sufficiently capture or display the cuteness. It's better to have lots of pictures to chose from even if you have to delete some later on.
When there is something worth photographing, take a lot of pictures of that one thing in a row. You've already got your camera out and you aren't paying per picture if you are shooting digital, so take advantage of the opportunity. (This is one great reason to own and use a DSLR.)
Consider the collection from which last week's picture of the week was selected. All of these pictures were taken in 48 seconds.