I'm probably opening a can of worms here but I would really like to hear from others on this.
The situation is this:
My lovely female friend is married to another woman. They had a DD. When DD was 3, they had a DS. DD had always been more interested in trucks than dolls. After DS was born, DD started saying that she was a boy too. The parents immediately switched to male pronouns and within the year they've changed the child's name to a boy name and even changed the birth certificate and the passport, erasing the child's birth identity. We're in a liberal US state.
I have trans friends, but they were all adults when they transitioned so I don't know what the healthy approach is for children. At 3 years old it seems to me that there's a possibility that being a boy was appealing since the only boy in the house (the new baby) was naturally getting a lot of attention. Also, a love of trucks and a dislike of dolls surely shouldn't matter.
I know my friends deeply love their children and think they're doing what's best for the child. I'm just concerned that perhaps the child isn't trans, but it would now be very difficult for him to change his mind. Changing the name and the birth certificate feels unnecessary at this stage. It seems to me that it send a message a child might interpret as 'they love me as DS more than they loved me as DD, so I can never be DD again no matter how I feel'.
Ironically, it seems very binary and limiting. They're already planning to use puberty blockers. The child takes part in trans events and has a whole identity based around this one part of him even though he's now just 7.
Do many very young trans children change their minds? Does this seem concerning or am I just out of touch?