Have plenty of food for the baby on the plane milk, toys, and energy to entertain your baby. Also, drink lots of water, get up and stretch or walk frequently and bring some snacks to eat to avoid morning sickness. Have the baby on a paci, bottle or sleeping while the plane is taking off and landing.
For more helpful tips here's a reference site
https://travelsites.com/helpful-travel-sites/ Hope it helps you to find helpful tips on your journey with your little girl.