I came across an ad for Gerber Baby food for "Graduates" which includes a line of highly processed, fatty and salty "snacks!" Seems to me that the implication is that babies get to "graduate" into eating just like the rest of America: snacking between meals and choosing processed foods with added fats, sugar and salt. Here's the line-up for 1953:
According to my research, Gerber didn't have a line of snacks for babies in the 1950s; it appears to be just meals and desserts.
Even the so-called "Junior" foods, perhaps the equivalent of today's "Graduates" line, didn't offer mothers crunchy, fatty salty snacks to feed their little ones.