I think the most challenging was the time I spent pumping, though overall the challenge is getting everything done in a day.
The funniest are definitely my son's comments, but I think the best part was his mother's day gift to me-- a picture frame he painted that said, "I love my mom because she plays cars with me and takes me to work at her office." LOL!
The best part is the perspective my son gives me about work. In the end, he will always be more important, and the ups and downs of a career are tempered by the bigger picture that he and my husband represent.