To be honest with you, I think it would be very difficult. When I started out back when dinosaurs roamed the earth, my first job was at Children's Hospital of Los Angeles. I worked in every unit there at least once including ICU and NICU.
The demand for nurses was very high then, though. Now that is not the case and new grad RNs are having a terrible time getting any job, let alone a specialty like that. Since your background is so strong in maternal/child nursing, though -- you might make a more attractive candidate for a job in a freestanding Birth Center or something like that.
I've found that hospitals are very quick to dismiss professional experience in a related field, volunteer experience, and personal experience ie taking care of a sick family member. They tend to want someone who has done exactly what they do and even has a similar philosophy. They actually look askance at a doula or a midwife that has not gone the RN to Certified Nurse Midwife route. It's pretty discouraging.
I always add the caveat that trends don't mean everyone and nobody can predict one individual's chances of success. The minute you make a blanket pronouncement it seems the exception will show up. Best wishes to you in your future career!!