YOU SAID:
your birth giver has a big head
INTO JAPANESE
あなたの出産者は頭が大きいです
BACK INTO ENGLISH
your baby has a big head
INTO JAPANESE
あなたの赤ちゃんは頭が大きいです
BACK INTO ENGLISH
your baby is big
INTO JAPANESE
あなたの赤ちゃんは大きいです
BACK INTO ENGLISH
your baby is big
That didn't even make that much sense in English.