I have a small-for-his-age 14-month-old who loves the bike trailer and sleeps blissfully in it, or just watches the scenery. So long as I'm pushing it like a pram, and he has no helmet on.
When the helmet goes on he tugs and twists it until it's over his face then gets enraged. He can be distracted after putting it on and gets used to it. Until he's put in the bike trailer.
The helmet pushes his head forward and down when he leans back. He hates that, so he always twists off to the side, slumps over, and lands up wedged in a corner, angry and uncomfortable. Putting something behind him helps a lot, but he still tends to slip over (straps aren't really small enough, etc.) and get uncomfortable.
I just discovered that if I wedge him in with panniers on each side he's comfortable as anything, and in fact he promptly went to sleep. I'm not too comfortable doing that regularly though, and it's awkward.
So. Any advice on a good way to support a small child in a bike trailer, so they don't easily slip over? He quite likes it when he's supported, but I don't want to use pillows etc. when I can't easily monitor him.
What do others use? If anything?