I have travelled to Canada 6 times in the last 2 years with babies.

My advise
take sachets of formula or toddler milk drink ithink its vanilla from S-26 or something. And dont bother taking any milk with you its pointless they have fresh milk on the plane and plenty of it for everyone. not a big deal at all. Press your little button and the stewart will get it for you warm it up if need be.

When you have children if you put the liquid, panadol etc in a ziplock. When you go through security they will ask if its for baby medicine food etc.. you say yes as it is they will open the bag have a look and send you on your way!

So not a big deal.