Edgar Kennedy specialized in playing characters who might start out friendly enough, but over the course of a film or a sequence are subjected to so many frustrations and obstacles (often from such expert chaos-bringers as Laurel and Hardy) that they gradually are overcome with fury. It made a reliable premise for Edgar's own series of "Average Man" two-reel comedies, where he plays a husband who is driven up the wall by the annoyances of modern life.
Here, however a lot of the comedy comes from the familiar formula being reversed. Edgar starts out in a non-unfamiliar grumpy mood and tells some people off obnoxiously, then becomes overcome with joy and kindheartedness when he discovers that his wife is about to have a baby (or so he thinks). This alone works surprisingly well for comedy. As another IMDb commentator points out, there is something a bit sad and poignant about Edgar's apparently fervent but by now apparently hopeless desire for offspring, and the way he regrets the way he's been acting we he discovers he's to be a father. In fact, the final scene in which he discovers he was wrong comes across as if Kennedy were a fine actor in a drama rather than a comic -- his tragic disappointment is palpable.
"Baby Daze" relies on the good old fashioned comedy of confusion and dramatic irony to keep it going for most of its fifteen minutes and this works fine, even when we have to buy that the OTHER Mr. Kennedy came into the maternity ward right before Edgar. Somehow the fact that he supposedly never noticed his wife was pregnant seems more in character than an oversight.
