Dirty diapers

Lee • Mommy to 3 year old girl! Baby #2 joining us March 2016!!!
My 3 1/2 week old has had lots of wet diapers but not dirty diapers in 24 hours. I've been putting his knees up, bicycled his legs and even tried taking his temperature. Any other tricks or tips before we go the Dr route? He doesn't seem uncomfortable.