I just flew with my 1 year old a couple weeks ago(20 months at that time).

Hardest part for me was entertaining dd at the actual airport. She kept me on my feet!

Otherwise during the plane ride, I had a pack of Welch gummies for dd. A 1 year old doesn't understand the concept of chewing gum so I had her eating gummies because they are more "chewy" for when her ears pop.

Also, I had brought and empty sippy cup and bought water to fill it up after the security check.

Anyway, if you dont have a window seat, ask the person at the desk beside your gate if he/she are able to change your seat for a window seat. That helped a lot!

Theres so much more I can add but its almost 3am for me. Let me know if you need any more advice :)

Well, plan it out. Have toys, snacks, music, baby shows, periods of helping your baby stretch and move, drinks, etc. for your child. My son did really well at that age. He sat in his own seat with his sunglasses and messed with my phone the whole time. Granted, it was only two hours lol. Good luck! I think it'll go well.

The first flight is 4 and a half hours, a 2 hour layover and then a two hour flight

How longs the flight? It sounds like fun to me but I love traveling lol