T.H.
Hi D.!
We fly a lot with our two boys (3 and 1), and I have flown a great deal with them without my husband (just me). It's very easy as long as you're prepared.
1) Never think you have too much formula or diapers. If you think you do, stuff in one more diaper to your bag.
2) Time your flights around naps
3) Let your baby eat/swallow during take off and landing (#'s 2 and 3 will let them sleep)
4) Wear your baby in a sling. I still gate checked my stroller, but having the baby close made them snuggle and feel secure and it kept my hand free to do whatever I needed to to (tend to my older one, etc.).
5) Always take advantage of pre-boarding for both you and your husband. You both can pre-board even with one child.
6) If your baby fusses, it's OK!!! I know it is uncomfortable, and you will get nasty looks. Sometimes there is just nothing you can do, so just take a breath and hum or sing to your baby while you rock them and don't look at the people around you. You can't control their lack of compassion so don't try.
7) Bring little soft toys and books...anything you can pull out of your bag of tricks to use as distraction (when they get to be about a year, the window shade is awesome!).
As for what you can bring:
You can bring as much baby formula or expressed breast milk, BABY juice (not regular juice) and baby food as you want, and it doesn't have to be in the 3oz containers like other liquids. AS LONG AS YOUR BABY IS TRAVELING WITH YOU. When I traveled away from home for business without my children, I had a tougher time getting my expressed milk back home through security--the female TSA's were much more understanding than the male TSA's--the guys just don't understand how much work goes into producing that much milk and ask you to dump it??? NO WAY!
They will NOT make you taste/drink it, nor will they force you to feed the baby any of it.
If you are using powdered formula try to purchase room temperature water. Otherwise, you will have a very clumpy mixture because you cannot bring your own water through security, so you have to purchase water once you're through security. Don't even try it--I have tried at several airports. While they're forgiving on premixed formula and BABY juice, they are NOT forgiving with regular bottled water. You don't really want to pre-mix your formula though since it spoils so quickly.
Second, I would have LOTS of diapers! You never know if you will have a delay, cancelled, delayed on the runway, etc. While it never happened to me, I have a friend who was delayed on the tarmack (sp?) for 6 hours!!! Not to mention her son had a bout of diarrhea. She thought she packed enough diapers in her bag, and she would have if they weren't so delayed...the rest of her diapers were in their suitcases. She went through ALL of the diapers she had with her while waiting and ended up with diarrhea all over her clothes and still had to fly from FL back home to Philly. It was horrible.
I apologize for writing a book, but I hope you got some good tips.
Have fun!!