Well, after 8 strollers, I can tell you there is a little bit of trial and error involved here to figure out which type suits you and your family best. (easybabylife.com)
Trying to determine which products to use sometimes is a little bit of trial and error as well to see what your son responds to and what motivates him. (pottyscotty.com)
It may take a good bit of trial and error to get it just right. (fieryfoodscentral.com)