J.M.
N. - I had a similar situation when my baby was 3 months old, but mine was for work travel.
I froze the milk in the freezer compartment of the hotel fridge (just request a fridge for your room that has a freezer). Then I put the frozen milk bags in my checked luggage, inside of a few layers of large ziplock bags, in the center of my suitcase. They were all still frozen when I got home. So, my advice: consider checking a bag.
And don't worry about any comments that your baby is too young to leave for a few days. When you get home just start nursing again like normal and it'll be fine.
Way to think ahead!!!