dear Madam, you shouldnt be worried because in most cases liver enlargement doesnt mean anything at this age and this is only mildly enlarged liver. also US is an operator depending test. You should do lab tests, especially bilirubin and liver enzymes parameters to rule out some serious disorder.What about gabys growth and development? If you didnt notice anything serious then it is probably something benign. Not only liver pathology can be associated with this finding, also every hemolytic anemia and some infections cause hepatomegaly. So red blood count and inflammation parameters should also be done. Depending on these findings you can plan further tests such as liver biopsy and genetic testing. But as i said go step by step and dont worry. Wish you good health, Dr. Ivan Romich