for those suggesting the bassinet I don't think those are available with Westjet or any Canadian carrier because they aren't approved by transport Canada. We bought a fly baby like this that hooks onto the folded up tray and straps around your waste and then you buckle baby in (like below)
On the way down to Arizona we asked first and they said no so on the way back we just hooked it up and tried it and were told we couldn't use it either
Thanks for the suggestions so far everyone