wanting to be pregnant

My husband and I have been married almost a year and I want to start a family here soon. Like in December of this year. He's in the Navy and he said he wants his rank to be higher before we start thinking about kids. But I have this longing for a baby like I think about it all the time and I REALLY want a child. I know he'd be a fantastic father and I basically raised my little sister and nephew since they were born so I know I'll be a great mom. But he doesn't want to start trying in December. I don't want one right now I want to start trying in December so I'll have one next year. And next year he should be a petty officer. What do I do to try to convince him? He said he wanted kids and he adores baby's so it's not like he hates kids. He just needs a little persuasion lol