First, unsnap the pants, being aware of which snaps are loose. Then take a hammer and LIGHTLY tap the head (or what you would call the male end) of the snap. If you tap too much or too hard you will flatten the head too much and ruin the snap altogether. With just a few light taps you should flatten the head just enough to hold the snap together again. Test the snap to see if you need to tap more or if you have succeeded in your first try. And there you have it, good as new snaps and pants that aren't constantly coming undone.
If you have any questions or my instructions aren't clear enough, please feel free to ask me. You can ask either on this blog site or on my Facebook page http://www.facebook.com/pages/Knoxville-TN/B-4-U-Ask/107161739321089?v=wall.
Hopefully this helps save some of your favorite child's pants from being banished to ''play" pants only.