If other suggestions here do not work, I suggest trying to use baby's clothing to gently tie knots to prevent arm movement. This assumes you are not removing baby's clothing completely and you need a long sleeved pajama or body. You then gently pull on the sleeves to encourage baby to retract their arms inside the garment. You then gently pull the sleeves together on top of baby's chest, above their arms inside the garment and tie a knot. To prevent the arms from escaping downwards, you need to either:
- For a pajamas you can pull the legs around their belly and make a knot below their arms (which are hopefully still inside the pajama)
- For a body, you can pull around the "flaps" on each side of the tummy and push the buttons together in the front
My baby seems to be quite content with this set-up - no crying or trying to escape, especially if I talk and smile to the baby and give a couple of kisses.
The other suggestion here on toys worked for a while, but I had to be inventive when even that could not quell baby's urge to touch the genitals covered in poop!