Hi!!
My husband and I took our little one in an amazing trip to Europe when she was about 7 1/2 months old. We were there 5 weeks, we visited different countries by train...Belgium, Switzerland, Italy, Spain and France..
The fligths were very exhausting, but we enjoyed every ride.
We took our big stroller even when everybody's recommended to take the umbrella type, you can carry everything in there, even your backpacks!!! to take a break..
It was unbeliaveble, the right time, she wasn't walking yet, and take her naps whenever she needed them...also I was still breastfeeding her..
Some people said that we were crazy by doing it, but it was a great experience (even when we did not party much :))
Highly recommended!!