Aah, umbilical hernia ke, a few of my mum friends went through this with their little ones too! Some did close on their own by age 3-4 (my friend's daughter's disappeared by herself), tapi some needed surgery depending on how big it was and if it got worse, definitely follow up with your doc on what they recommend for your girl, sebab setiap baby berbeza. Sending you strength, mama, I know it's scary hearing "operate" but most babies do really well with it!