I'm thinking of not changing the baby's soiled diaper.
Why are you considering not changing the baby's diaper?
No one else is here, and I don't want to do it. We'll be fine.
If there's no one else to do it, then it's expected that you will. Going too long without a change will harm the baby and you would be held responsible.
Why would some random stranger on the internet tell me how to live my life? I'll do it when I'm ready to do it.
It's not okay to neglect a child by not changing its diaper. It's uncomfortable and can lead to diaper rash. You should tend to a child's needs, or you shouldn't be entrusted with its care.