That is fine. Check with you dr first, but should be no problems. Bubs shouldnt fly till after they are 6 weeks old, due to cabin pressure etc. They only thing i would be concerned about is going in unpressurised airplanes - like little senic tours etc.
My sister flew with her bub Melb to Perth when he was about 7 - 8 weeks, and he was fine. She may have b/feed him on take off and landing.
I fly abit between melb & perth, and in all the time i have flown and there have been little babies on the flight, mostly, i never knew they where on there, didnt hear them at all.