I just found out my sister is expecting her first. She made a comment about wanting/expecting me to come out and help when she has the baby, as I did with our brother when he had his first. The issues are that:

1) I didn't have my own child when my brother had his, so leaving at the drop of a hat was a lot easier than it is now
2) She lives on the other side of the country
3) We have a planned visit to see her a month after her due date anyway (Thanksgiving)
4) She did not come to help me when my baby was born but came out 7 weeks later to visit my parents and me.

Leaving my toddler son is hard to do, but I feel bad saying no to her. Would you go anyway out of obligation, or put your own child/family/needs first?