I had to laugh about the part about DD and a sippy cup. I did nurse DD (21 months) the last time we flew, a few weeks ago, but only to take a nap, not for take off and landing. She looked like her ears were bugging her, so I suggested to her that she drink from her sippy cup to make her ears feel better- SO SHE STUCK HER SIPPY CUP IN HER EAR AND GAVE ME A HUGE GRIN! It totally cracked me up! She did it for take off and landing.
PS- we still do the lap thing to save $. No big deal. Sometimes we luck out and get an empty middle seat next to us, sometimes not. Lap is fine. I'm dreading paying full fare!