My daughter had the same issues. I used a pillow to put behind their lower back. They are super uncomfortable in there and it seem to bow their back. That then pushes their head forward in an awkward position kicking off the helmet.
I took one of those small log like pillows filled with those bead things and put it behind her lower back and it fixed it! Threw some toys/books in there and off we went. She was pretty good with the helmet...we would reward her with a sticker to decorate her helmet with after a ride. She loved that.
Hope that helps! The youngest is now on the trail-a-bike and the trailer is our gear hauler!



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