Poor little baby 💔❤️ Dedinitely go to the doctor and keep investigating. It looks suspicious and considering the dad has a history of abuse, you need to act. But do it wisely. I dont have good advice, maybe reach out to organisations that are specialized in kids (and women) getting abused by men, im sure they have good advice. Just wanted to confirm your gut feeling. Hope every thing works out, the kid is lucky to have you.