A calf born at a farm in Oklahoma is becoming internet-famous thanks to the rather timely markings on his head. ‘Sweetest Little Valentine’Wanette is a tiny town of less than 300 people, a short drive south east of Oklahoma City. It’s also the home to Merchen Farms, a cattle farm with the motto “from our pasture to your plate.” A calf being born on the farm is nothing new. That’s just what they do at Merchen Farms. A calf with a heart on its head born in the weeks leading up to Valentine’s Day, however, turned out to be a pretty big deal. “God is so fun,” Merchen Farms said in a Facebook post …