How would you feel if your kids call another women "mommy"?

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Although you are their biological mother, some kids get attatched to other women. What if your child really loved one of your closest friends, their babysitter, your ex-husbands new girlfriend, a teacher, an aunt or grandmother and started to call them "mommy"? The child who you gave birth to started calling another women mommy, how would this make you feel? Would you feel unloved by your child or think nothing of it? This is a fragile subject but I would love to know what mothers to mothers-to-be think about this.