My baby is making difficult to change her because of her movements.
Is the baby fidgeting (about)? Is she wiggling? Or is she even doing something else?
Which word is the right one? What are the differences in meaning?
"Wigging" is one possible term for the kind of movements that would make her difficult to change. "Squirming" is another, possibly followed by "around" or "about".
Wiggle: a small, quick movement up and down and/or from side to side
Squirm: to make twisting movements with the body, esp. because of embarrassment, pain, or excitement
"Wiggling" is the movement itself, while "squirm" also implies the baby is too excited or upset to lie still.
The baby keeps squirming about and won't let me put on her diaper.
To me personally, because "squirm" rhymes with "worm" it suggests the baby is wriggling about like a little worm, which (to me) sounds cute.
"Fidgeting" can also work, but it's more common with older children who move around because they're bored, or have too much energy to sit still.
After ten minutes of the new teacher's dull lecture, half the class started fidgeting in their seats.