The horses in the picture look to be in great shape. Horses need jobs and sitting in a pasture eating grass all day is not a job. Good for him, he’s doing what he wants to do. He’s living a better life than most.
The mosquitoes have been brutal in Argentina this year. Mosquito repellents sold out early and travelers warned to bring their own because you can’t get it in Country. I don’t know about Brazil.
If your pediatrician asks what gender you assigned your child at birth, find a new pediatrician. You don’t need any further evidence the doctor is crazy.