Ectoplasm Ghost Picture: Ectoplasm or Anomaly?

Is this anomaly ectoplasm, or something else explainable, such as the baby throwing some yogurt into the air? Beckie Corrales would like to know your theories. E-mail Beckie at:

"I took this picture of my son Frankie at the L.A. County Fair. When I took the picture, there was nothing there; only when I reviewed the pictures with my sister-in-law did we notice the white object by his hat."

The anomaly that looks solid, with shadow, and strikingly similar to ectoplasm manifested through mediums about a century ago.  See: Mediums & Ectoplasm.