Absolutely, go for boots - but ring and book it first (have done so myself!), but you can still have a problem if you have a stop somewhere.
I have also bought before getting onto the plane, and they don't enforce the 100 ml limit for baby milk/food. When they asked me to taste them, I asked them to pick one. They picked one ready made milk and one food in a tub, which I then tasted. (Make sure THEY pick it). I then just used that one first so no problem!
In Singapore they are friendly as, when it comes to children, and when I stopped there on the way to Australia, they asked me what was in the bag, when I said it was for the baby, I was just about ushered through they were so sweet .