actually, I think is better to stay with your mum, she also can help you look after your child. You can try to convince your husband since you are your mum's only child.
If she stay alone, what if some things happen to her? Who will know, if she sick, who take care?
Alternatively, maybe you want to consider buying a unit next to your mum's place. So that your can have your own space while still living close to her.
Frankly speaking, I would be very sad one day if my own daughter dont't want to stay with me.