>>51449 (OP)
Amusing responses aside.
Go find the local kink community and be prepared to make friends. Great friends or fuckbuddies might indulge this for you if you're willing to help them out.
Otherwise consider a professional. Find either a professional nursery, nanny or a dominatrix that offers AB friendly services.
This is probably cheaper than any other option if you just want to do it once now and again.
Otherwise find a person, fall in love, be open and honest with her and tell her you want to do this.
The availablity of every time of porn on the internet along with pictures of every act makes us believe that we should both be able to get this, receive this and it'll fit every fantasy.
You might also struggle to reconcile what you are supposed to be (societal expectations) with what you want (baby treatment). I know I went through a phase of trying NOT to accept that I really like this kind of thing.
If you are a sadist and want to hurt someone - there is a masochist out there for you.
There is a mommy, caregiver or nurturer out there for you. Be a nice person, find the fetish events where they hang out and go meet them.
if you cant get motivated to socialise and meet people that might already be interested in the same kinks as you - don't expect to find anyone online.