My baby girl of 1 year 5 months old has something like lump in one of her breast. I noticed it when she was 2 months, took her to thechospital where she was born but the doctor said that i should not worry that it will dissolve. I took her to another hospital when she was 9 months, the doctor said the same thing. Now it has become noticeable. One breast is bigger that the other. No pain, should i still leave it like that?