My first daughter had this as well nd it went away before she was born. Only sign she had it now is she is prone to getting utis a lot. Nd she has to eat a thing of yogurt a day to try to keep infections down. Other than that she is healthy with no other problems.
They found a cystic hygroma on my daughters neck at 10 weeks nd by 16 weeks it resolved itself :) dnt stress nd stay positive :) good luck!