YOU SAID:
I will have a baby in ten years.
INTO JAPANESE
私は10年以内に赤ちゃんを産みます。
BACK INTO ENGLISH
I have a baby within 10 years.
INTO JAPANESE
私は10年以内に赤ちゃんをもうけています。
BACK INTO ENGLISH
I have a baby within 10 years.
You've done this before, haven't you.