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Originally Posted by JennyClaire 
Stupid question: How can you tell whether you are feeling Baby A or Baby B? My baby (assuming it is just one) is moving all over --- I have no idea how I'd be able to differentiate between one baby or another if there were two. Are twins more "locked" into one position than singletons?
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In my case, the twins are in separate sacs, with a membrane between them, and one is very clearly on the left, and the other on the right. Twin A is A because she's a bit lower down, closer to my cervix, so she'd be born first if I delivered vaginally.
I don't get any movement at all in the middle, just on one side or the other. And they've been head-down and pretty fixed in their position for awhile now. It's a lot more crowded in there-- the movement feels more like what you get at 34 or 35 weeks with a singleton. So it's pretty clear which one is moving when they move. It's weird, too, because I'm always comparing them-- Baby A is WAY more active than B most days, but every once in a while, B will kick A's butt for a day or two.
Literally, I'm sure....
I have a great u/s pic of A kicking B in the head, which B tries really hard to squirm away.
I would guess that with twins in one sac, or twins in a less clearly defined position, it would be pretty hard to tell which baby you're feeling.