I worked as an MA in an outpatient clinic (Reporoductive Endo/OBgyn). I used to work with nurses in the clinic and yes most of them will do Triage, and mostly teaching.MA does the venipuncture, vital signs, etc.
If you really like to work in an OB/GYN or PEDS setting, I'd recommend inpatient setting as an RN, where you can do more hands-on.
Medical Assistant job is way different from an RN, the salary (esp you have a child), the knowledge/skills, and the flexibility/ opportunities.
I am currently in the nursing program and i really like it better than an MA.
GoodLuck to you!