My wife had given birth to our second child a month and a half earlier, and was nursing her. Our oldest was two years old. According to halacha, my wife had to fast. I wondered, should I spend all day in the synagogue as usual on Yom Kippur, or should I take care of the two year old at least part of the day so that my wife's fast would be easier?
I called Rabbi Shlomo Min-HaHar zt"l. He was incredulous that I even asked the question, and replied that of course I should help my wife take care of the children.
So that Yom Kippur, while everyone was in the synagogue praying Minchah and Ne'ilah, I was wheeling my first born around the neighborhood in his stroller.
Here's a link that deals with some special situations on Yom Kippur.
Gmar Chatima Tova!