Am I being unreasonable?

Heather

My husband would like to take myself and my two children up to New York City for a night to see frozen on Broadway. We have a six month old and I am nursing her and he wants me to leave her at home with my mom or a babysitter. Am I am being unreasonable when saying no because she’s nursing and she still gets up two times a night and I feel that it would be unfair to my mother or a babysitter.