I agree with Trevor and BabyBobby. This may be what you would like, but in reality you have almost zero chance of finding it unfortunately.
I'm sure that there are some women out there who would go for it, but by far the vast majority would also want to have a partner who can satisfy there adult needs as well, and I'm not just talking about sex. As an adult you/me/we/they can all enjoy our little times, but also need a partner who can offer emotional support, make clear adult decisions and function as a part of society, at least most of the time. Bills need paying, decisions need making, repairs and maintenance need too happen, shopping needs doing.
Most importantly support of each other's needs and problems need attending too. It's not just about you needing to be a baby, but also fulfilling the emotional, physical and psychological needs of your prospective partner as well.
It sounds like you need a paid nanny and not a partner. I'm not trying to sound harsh, but it comes across as a touch selfish to expect a partner to do all the work for you. But, if it's just a fantasy you're talking about, you're quite entitled to it.