Dating Gerber Baby Litho Prints

I'm having trouble researching these 5x7 Gerber Baby prints. While the print is marked Copyright Gerber Products Co. 1931, and I see quite a few listings on Ebay and Etsy declaring this to be a product of the 1930s, I strongly suspect they are more likely from the 1960s, or maybe the 50s. They were in my mom's basement, and while in great condition, I don't think it was something she paid for. I have a feeling they may have been part of a "gift" for new mothers that included samples of formula, etc.Does anybody know anything about these?

GerberBaby by Brenda Anna posted Jul 18, 2016 at 9:33 PM

 

This article from THE HUFFINGTON POST may be of help:

http://www.huffingtonpost.com/2014/05/27/ann-turner-cook-original-gerber-baby_n_5395425.html

Debora