This is the exact thread I am looking for. I am also traveling to Nepal w/ my fove months baby by London and I have same cocern as yours. What is a lightweight stroller? I have one from evenflow, little bit bigger in size and confused if the airlines will allow it. Also five months baby can not sit upright. It is more comfortable if car seat is used on stroller. Do the airlines allow car seat on hand carry (we are ready to reduce hand carry if we can take car seat with us). Stroller + Car seat would be much helpful during long transit in London.

How about liquid/powder baby formula and cereals?