Aw, don't they look so pitiful with that collar on.
My Trixie goes to get spayed on Friday, I'm so nervous. When I had Coco and Pebbles done I bought a super teenie collar at petco, and they never even needed it. Never bothered with the stitches at all... Thankfully... Maybe your baby just doesn't like to be in the onesie. The ones I have are a little too short in the body for my Trixie, because we have been trying them out, and she absolutly hates the onesie. I have to go pick up a collar for her for Friday. Good luck. Sending great big hugs from Coco, Pebbles and Trixie for a speedy recovery for your baby.
