Do you like it when girls say this?

Is it like a compliment when a girl tells you "I wanna have ur babys" cuz any guy I joke to them about this they become giddy and are nicer and it makes them so happy why? I'd really love to understand the inner workings and feelings behind this so instead of asking the guy I'm talking to what it means I feel it's better asking guys on the internet about it :)
Do you like it when girls say this?
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