Hi, and welcome!

The big problem with Gender Dysphoria is that it doesn't get better on its own. You can ignore it for a long time... years, decades, your entire life... but that horrible feeling stays with you, and it has a tendency to get worse with time if you don't transition. Wishful thinking simply doesn't make it go away.
It's entirely up to you whether you think your marriage is worth more than your sense of self. I would argue that it isn't: you cannot expect to be truly happy within your marriage if you can't even stand being in your own skin. And what will happen when your dysphoria inevitably gets worse? You'll know that your wife is the reason why you felt forced into making this decision: will you start to resent her even more? What kind of marriage would you have at that point?
There have been some cases where spouses have stayed with us through transition, but in most of the cases where our spouses are unsupportive, our marriages have had to end. That's what happened to me: I was married for 15 years before I came out to my husband, and he immediately decided that he didn't want to continue with our marriage if I transitioned. So we had to separate.
It was painful at the time, but I got over him surprisingly quickly. Now, when I look back upon my life and our so-called marriage, I see that he never had my best interests at heart, and I'm much better off without him. Your wife, too, does not appear to have your best interests at heart, if as you say she can see the pain your dysphoria is causing you but is pressuring you to stop transitioning.
My advice to you? Go back on your hormones. Talk to your wife, and negotiate a new relationship. You might not be able to remain married, but you will always be co-parents to your child, and as such you can at least be cordial towards each other. And it's much easier for a young child to accept their parent's transition than it is for an older child or teenager, so the sooner the better really.
My transition has cost me my marriage. And I couldn't be happier or more content with the direction my life is taking.