The song "Mummy's Tummy" by Rathergood.com is a playful and sweet tribute to the excitement and anticipation of a child awaiting the arrival of a new sibling. The lyrics convey the child's innocent and charming perspective on their mother's pregnancy, as they express joy and curiosity about the "precious thing" growing in her tummy. The child marvels at how the thing in their mom's tummy is getting bigger every day, and playfully imagines that it must be a "digger". The song captures the wonder and excitement that children often feel when a new baby is on the way, and highlights the special bond between siblings. Overall, "Mummy's Tummy" is a heartwarming and whimsical song that celebrates the magic of new life and the joy of expanding a family. It is a gentle reminder of the innocence and wonder of childhood, and the precious moments that come with the arrival of a new baby.