After dropping out of school, Annie Burroughs (Phoebe Cates) gets on the bus and heads to L.A. where her sister Marsha (Pamela Bellwood) lives with her boyfriend David (Ted Wass), a doctor. Whilst Marsha is busy setting up her own gallery Annie tries but struggles to find a job with David ending up employing her as a receptionist at his practice. But one thing leads to another as with Marsha always focused on the gallery David starts to flirts with Annie and that ends up becoming a full blown affair behind Marsha's back. That is until an incident leads to Marsha discovering that David has a girlfriend.
From a time where it seemed almost normal to include a gym scene where women in lycra pump there arms for no reason other than I imagine to give any men watching some thing to stare at, I have to say that "Baby Sister" is not the most compelling of movies. Yet "Baby Sister" happens to feature a young phoebe Cates wearing a lot of tight clothing which makes her not just the baby sister but the smoking hot sister. As such, and I know this is basic, but "Baby Sister" is a movie which will work best for those who have or had a crush on Phoebe Cates.
Anyway, aside from Phoebe Cates what you get in "Baby Sister" is very much that classic tale where a guy dating one sister finds himself falling for the younger sister not just because she is hot but he is feeling ignored by his workaholic girlfriend. That is pretty much it and whilst there are a few moments of drama involving drug addicts the drama is not what the movie is about neither is it the romance. In fact beyond being a vehicle for a young Phoebe Cates I do wonder if this movie has any other point.
What this all boils down to is that there is very little to say about "Baby Sister" as it is a basic movie which feels like it is simply a vehicle to highlight the talents of Phoebe Cates, especially how attractive she was.