Really? You think a promise to change all the diapers and stop drinking soda pop should be as important as having enough time, energy, and money?
You abd your husband are definitely not on the same page. You want what you want now. You belittle your husband's concerns about the future of your family.
I suggest you learn about the future and financial planning before talking about another baby. Then make a list, by age, of your children's emotional, educational, and physical needs now and as they get older. Are you AND their father able to provide for those needs. Are you,saving for their college/training after high school? Are you putting enough away enough money for your own retirement? I have a good retirement plan, SS, and investments. I wish I'd planned better. The 3 incomes does provide me with a comfortable retirement and still not enough to do some things I want now. Prices keep going up but my retirement money is not able to keep up.
I suggest that once you take his reasons seriously and work together to plan for the future he will be more willing to listen to you.
I suggest you take a financial planning class and/or talk with a financial planner so you can accept your husbands concerns. Do you work from a budget? Are you putting money away for your children's education? Money for unplanned medical expenses. Do you have a separate savings to live on in case of illness, job loss, or catastrophe?
I suggest you list your emotional, educational, physical needs for your children. What are you and your husband's needs as the children grow so that you can be supportive with each other and your children.
Seems to me you're totally focused on what you think you need and haven't considered the big picture. You trivialized.you husband's concerns. The two of you are polarized when you need to work together. Of course you don't plan to leave your marriage. I suggest that if you continue to bully him into agreeing to a third child, your marriage is at risk.
I urge you to get counseling for help in working this out. I also urge to get financial counseling to show your husband you do care about him and his reasons for not wanting a third child.
BTW. How do you know there is enough money? How do you know your husband has enough physical and emotional reserve to care for 3 children? Do both of you have time and energy left over at the end of the day?