P.P.
My daughter had this too when she was about a year old. I used the estrogen cream. My dr said to just use the tiniest amount, the size of a piece of rice, and it opened up in a week's time. I was worried about side effects, like her growing breasts and facial hair since I read about that online, but she had absolutely no side effects. It worked so well. I was also told the adhesion would probably go away on its own, but while it was adhered there was a greater chance of her getting a UTI, so that's why I decided to give the cream a try.
Good luck to you with whatever you decide!