i know target sells ego friendly diapers :) as for traveling with a baby that young i feel that it is best for them to be in their own seat just so you can also have free hands. with the cloth diapers i would suggest maybe using them when you get to your destination and using disposable earth friendly ones durring your flight and lay over. make sure you have something for your baby to suck on when taking off and landing the air pressure can hurt their ears (i gave my daughter tylenol when we boarded and it helped). also have you and your husband board early with the baby so you can get situated before everyone is pushing by you. what i took with my daughter (in lap) when i flew alone from california to washington state when she was 8 months old was this-
1. small diaper bag
2. like 10 diapers (with plastic bags to put them in)
3. 2 cups (empty)
4. a change of clothes (in case an accident happened)
5. small quiet toys (which i didnt need lol she liked the fold down table and the window lol)
6. blanket
7 jarred food and snacks (but your baby is too young for that)
8. can of formula (i bought water after i went through chec in)
9. tylenol and anyother meds that she needed
i hope this helps you a lot! good luck on your trip!!!