I don't spread Princess Piglet's legs either.
While I have her feet held with one hand, I bring her legs back towards her a bit, so her knees are close to her belly, and lift her a bit. Helps spread the rear area to her chubby rear better lol. That's just me, though.
{gosh, not only could I NOT visualize that right ... but I had to sort of act it out with my hands so I could tell if I had it right. Must be bedtime
}