Jessie James Decker has urged new moms to be “kind to yourself” after giving birth. The 36-year-old star – who has four children with her husband Eric Decker – has taken to social media to send a supportive message to new moms. The singer – who gave birth to Denver on February 9 – wrote on Instagram: “Be kind to yourself. give yourself grace. We are healing after growing a human being for nine months. And if you’re breast-feeding like me and your body needs to hold on to as much weight as possible to keep making milk, then let it. Focus on that sweet new baby because that’s what it’s all about…