Enlarged kidney

Worried mama here! We had our anatomy scan on Friday and were told by my OB that our little girl had an enlarged kidney. She reassured me there is nothing to be concerned about and that it normally corrects itself. I have to go back in 4 weeks because baby wouldn't show her lips and nose and doctor stated they would remeasure kidneys then. She said that our little girl is perfectly healthy. Even though she said it's nothing to worry about I'm still finding myself worrying! Has anyone else been through this? I could use some input!