i am going to call my ped tomorrow morning about this, but wanted to see if any of you had had this experience. my almost 6-month old son has gone 3-4 hours today without urinating. in fact he has had only 3 wet diapers the entire day! he is a really active kid, nonstop. his behavior hasn't changed at all. he is exclusively breast fed and his eating habits haven't changed either (he's basically a snacker; eats every 2 hours for a couple of minutes). should i be concerned?