Was Brooke Shields the Gerber baby?

I'd heard that Brooke Shields was the original model for the Gerber baby logo. But I guess that's not true, especially since it turns out that they started using that logo in 1931. It's not Humphrey Bogart, either.

Since Brooke Shields and the Gerber baby came up in conversation, I've been wondering where that came from. How did that get into my head? Well, snopes.com has helped a little with that. It turns out that Brooke Shields did appear in some Ivory Snow ads when she was a baby, though she never appeared on the box. Porn star Marilyn Chambers did, though -- but not as the baby.