What could it mean if a guys says he wants you to have his baby?

Anonymous
Me and this guy have been talking for a while, I'm 17 and he is 20.. He told me the other day that he wants me to have his baby.. I told him I do want kids one day but I'm not ready for a child now.. He said he isn't ready either but one day he wants to get married and wants me to have his baby.. What could this mean?. Is he being serious possibly because he is older or is he just 'talking'?.
What could it mean if a guys says he wants you to have his baby?
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