I am 8 months pg and can carry my DS in the hip carry with my OTSBH, so your Maya may work. (I just have to get him high enough and wrap his legs around the top of my belly. However, I sling him for shorter trips, not hours at a time.)
What about a Kozy? You could use it for your toddler and the new baby. www.kozycarrier.com
What about a Kozy? You could use it for your toddler and the new baby. www.kozycarrier.com