Do I have to ?

Let my daughter when she turns 6 months to stay over nights with her dad? He isn’t going to be the one taking care of her at night it’ll be his sister, and I just dint see the point in that if I’m breastfeeding and that’s all she knows as of now we have a set schedule I don’t wanna change that for her every night she’s with me so if she goes a night without me I wouldn’t like that ...