H.B.
Hi there,
I definitely know how you feel. My friends and I, all who have recently had our second babies, all feel like we are neglecting the first. So, you are not alone nor are you a bad mommy. What I would do is that each time my baby had a 'down' moment- in a bouncy chair or on a blanket, I would grab my older one and read a story or play a game or with a toy. I would arrange for special mommy/ son dates on Saturdays when my husband was home and my husband also got a date with our son too. I'd be sure to listen to him when he wanted to tell me something and I'd push him on the swings so much, all while wearing the Bjorn with boy # 2.
But of course the older one felt sad since I couldn't devote 24/7 to his needs. This is actually a good thing, since the world will never think he is #1. He is learning to share, to be patient, and to love a sibling (which is now happening, now that the little one is 15 mts. and can play with him). Also, the age of 3 is hard! My deal is if my 3 year old is being kind and using manners, then all is good. If he is unkind or being rude, he has to stay in his room until he is ready to be kind or polite again. This includes the never-ending questions- which I find quite rude after a while.
Her life is and will be different from now on so I think the best bet is to create a new style of life- a 2-kid style- rather than look for what you used to have. It will only frustrate you and that won't help at all.