I am also an old hand at doing this as I used to back to Ireland every 6wks with Eve on my own.

RE milk. Get the premade ones and do not open till through. Security will not ask you to open these. If you need drinking water, put it in another cup/bottle and you will have to test this. Or, buy a low sodium one on the other side (Evian is fine).

Regarding your buggy and picking it up on the other end, you can explain to them that you will not be able to manage without it when you get off the plane and you would really appricate it if they could get it for you. This works for me. If you don't have an easy buggy to "pop up" (ie do it with one hand whilst holding a baby), get a cheapy one.

Also, forget about using the overhead lockers, put your bag (yes, only one!) under the chair infront of you. Ideally, use a small back pac to hold all of C's stuff. You only need nappies, drink. Food (french toast, cheese, rice cakes - no mess) if necessary. I take it is a short flight so no need for loads of toys, just a fav. Make sure you can pack all into one bag. Put your purse and tickets in it as well. This will make it a lot easier to lift baby on and off plane as well as deal with the buggy.

Hmmm, think that's it.

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Ah those were the days!