Babies and Toddlers Combined, a Solution to the Inanimate Babies.

I like a lot of the ideas you mentioned besides babies and toddlers being merged I think both should be completly sepeate life stages with their own model combining the two in my opinion just wont work or look good. With toddlers just leave them as in and add in all the baby improvements you would see in the first year of life from gaining strength with tummy time to learning to crawl and eventually being able to prop themselves up holding onto objects like a coffee table and with that they are ready to age into a toddler who's just learning to walk.