There is one photo of Jr as a baby (not infant) which was posted at the Chicago Tribune. The photo was released after the death of Madelyn Dunham Nov.2/08. The photo was professionally done and Jr is the only one in the photo. I guesstimate his age as between 6 & 8 months at that time. FredNerks has the most extensive collection of Jr photos and perhaps will post the baby image here. I concentrate on finding out information leaving the knowledge of posting images to those who are more adept with their arms and familiar with the process.
The photo you have posted is of a toddler in training pants after he and his mother returned to HI in early 1963.