My son is 20wks old. He takes between 15mins to an hour of grizzling, crying, screaming to go to sleep. I go in every 2 mins and comfort him without picking him up and he does eventually go to sleep. Could I be getting his cues wrong? I hate nap time as it breaks my heart to see him upset, but if I get him up he doesnt want to play or feed just wants to be held. He doesnt have a pacifier but sucks his thumb and sheet (kind of like Linus from Peanuts). Any suggestions?