YOU SAID:

my mom has a big head.

INTO JAPANESE

私のお母さんは大きな頭を持っています。

BACK INTO ENGLISH

My mom has a big head.

INTO JAPANESE

私の母は大きな頭を持っています。

BACK INTO ENGLISH

My mother has a big head.

INTO JAPANESE

母は頭が大きい。

BACK INTO ENGLISH

My mother has a big head.