YOU SAID:

i had eleven children last month

INTO JAPANESE

私は先月11人の子供がいました

BACK INTO ENGLISH

I had 11 kids last month

INTO JAPANESE

先月は11人の子供がいました

BACK INTO ENGLISH

Last month I had 11 children

INTO JAPANESE

先月私には11人の子供がいました

BACK INTO ENGLISH

Last month I had 11 children