What are the options for extending a NON-O visa for a family including a newborn in Thailand?

Hi, my husband and I plus our two kids are in Thailand under a non-O volunteer visa status, and have been extending ever since we entered the country in 2019. My question is about our 3rd baby... he was born here in Thailand in October, and we don't want to leave the country to apply for new visas in the U.S. until he's a little older. However, we are up for extensions this month. Does anyone know what we can expect at Bangkok immigration? I'll ask when we go, obviously, but would love to know our options if anyone has gone through this scenario before.