I think it's sweet that you want to be a better Mommy for your baby boy
I've been lucky enough to have had 3 lovely women in my life who have been a Mommy to me. For each of them, learning to care for a big baby was a bit of a learning curve. I think the best way to be the best Mommy you can be, is to simply be open with your little one, put your best forward and take your time. The more he regresses around you and the more you care for him when regressed, the more natural the entire dynamic will become, you'll find that you can read your baby's moods and you will both grow closer and closer to each other when in that role. Bottomline, becoming a good Mommy simply means taking your time and being there for your AB/Little
As far as breastfeeding, my current Mommy/GF is the same way, that is certainly something she has mentioned and wants to do with me when regressed. My Mommy/GF is very diligent, she has been doing her research and it is very possible for women to lactate without having been pregnant. I believe if you search online there should be manuals and resources on how stimulate lactation within an ANR relationship.
The closest thing to that would be Fetlife and even then, there are no guarantees and your mileage may vary. Still it's a decent resource for connecting with other ABs, Littles and Caregivers in and around your area.
I still believe one of the best ways to find a Mommy or a caregiver is to simply form a tight relationship with someone and then reveal to them your AB/Little side. If you want an AB and Mommy dynamic to be a longstanding part of your relationship, you really have to take the time to get to know someone, that never happens on a whim
