Just reading back through notes to friends and remembered that Sophia was home 4 weeks before she dared get out of bed in the morning.
I'm not sure how things worked at the orphanage, but the flatness of the back of her head tells me she was tied down on her back in her crib - we've read many accounts of this happening in Chinese orphanages in rural areas due to lack of help on the overnight shift. The way she is very flexible at her waist, but her back moves as one unit reiterates that. I think she could reach her toes, but not lift her head the way she was restrained.
Now when she's in Gymnastics, they tell us she has great core strength for someone her age I think it's because she's used those muscles to pull her feet up to her face so often to keep herself entertained when tied on her back. However when she tries to do a somersault, it's more like a front flip because her back doesn't "roll" the way you'd expect. She smoothly bends and puts her head on the ground and then her whole spine flops over together, without rolling or curling
Anyway, on the morning that she'd been home 4 weeks, she got out of bed by herself and came in and stood in the doorway and said, "Hi!" and it was a big deal for her because she'd been afraid to get out of bed on her own prior to that.