The best piece of advice I received when pregnant: 'Guilt is a choice.' It rewrote the script in my head and put me in control. Feeling a bout of mom-guilt? Try this:
Take the long view. You will be a great mom and great at your job - just rarely on the same day. Look at your overall week or month.
Surround yourself with other working moms. Guilt is rooted in isolation. Be vulnerable. Share your story with another mom -- trust me, she's been there.
Celebrate your wins. Change the script from what you aren't doing right to what you are. Give yourself credit!
Ask yourself, 'Where is this coming from? Are these my expectations or somebody else's? If they are someone else - LET IT GO.
We have enough real issues to deal with. (Hello, terrible twos!) Let's give ourselves a well-deserved break.