It's not really anyone's business but your own.
I also don't see why people always say 'what if you had to leave them in an emergency?' as if that is somehow going ot be different for the child than if you leave them for the first time in a planned situation.
I don't leave my daughter overnight ever. I seriously doubt I ever will leave her overnight until she is old enough to ask to go herself, if she wants to. I didn't do the same with my boys and now I look back on it I feel sad that I wasted their young childhood in a way and so much of me thinks I wasn't really ready to be a parent then and that I have much more to give now.
I also didn't leave my daughter with anyone except her Dad until she was about 9 months old and even when she was left with her Dad, except one night out it was while I popped to the shops etc. The first time I did leave her with a friend, she was just fine, no crying, just fine. She is now 20 months and is a happy and secure child and so secure she will happily stay with someone she hasn't even met before. (We use an agency for babysitting now as I would rather have a 'professional' and although we know the sitters now, we didn 't the first time they sat)
I am my own person, I do have a life of my own, but my children are my life and I don't feel any desperate need to spend time away from them.