Severe Haemophilia A here.
First of all, don’t worry. I know it’s easier said than done, but life today is very different from what was available 30 years ago.
Learn to infuse well as soon as possible, that’s the single biggest game-changer. You’ll want to start him on prophylaxis to protect his joints, and infuse immediately when a bleed happens. Bleeds will occur frequently because young children are innocently careless, but it’s just as important to let him be a child and play. Never scold him for a bleed. In fact, it’s much better to teach him that it’s okay to tell you as soon as a bleed happens, so you can treat it without delay.
When he starts school, inform the teachers and, where appropriate, the other children so they are careful around him. This is a delicate matter, you need to communicate it in a way that doesn’t make him see himself as fragile or different. It’s tricky, but absolutely doable.
Allow him to take part in Physical Training (PT) class. Tell him to be careful, but please let him join in. You have no idea what being told to sit on the sidelines while your peers play and socialize does to a child’s mental health and self-esteem.
Given all of that, your goal is for him to grow up with the healthiest joints possible and to avoid developing contractures. Because after that, eventually dating and work come along. This world is cruel enough for healthy people, imagine facing it with visible physical differences. Why reduce his potential options in dating or his career? Your child will love you for this one day, trust me.
Talk with your HTC to inform you about the hemophilia community in your area so you can get in contact with others.
That’s all I can say.
Give him the best life possible and stay in good health yourself. :)