Carrie Underwood writes a heartfelt tribute to her son Isaiah on his 6th birthday. She describes Isaiah as kind, funny, smart, and a loving big brother. Underwood expresses gratitude for being his mom and celebrates his gifts and imagination. She also shares pictures from his Power Rangers-themed party, including a photo of her and Isaiah hugging and a close-up of his Power Rangers cake. Underwood's husband, Mike Fisher, also shares a photo of their younger son, Jacob, on his birthday. Underwood previously opened up about suffering three miscarriages before welcoming Jacob.