Yes, Hello, Our Daughter Has 2 Small "jelly Like"lumps Under

Yes, hello, Our daughter has 2 small "jelly like"lumps under one of her breasts. A month ago, she went to see a general doctor and he said that those small lumps did not seem alarming at all. He told her that those lumps normally disappear with the time. If they would have been solid lump, then there was something to worry about. He said she was too young to go for a mammography. He reassured her that there was nothing to panic. Is this really so?