Continuity mistake: While Ethel's looking at the Baby Pictures we see her fingernails are short and not polished, but in the closeup of her hand holding one of the photos the fingernails are long with dark polish.
Continuity mistake: When Lucy and Ricky are sitting on the coffee table looking through photos of Little Ricky, just as Lucy quips, "What magazine, body beautiful?" in the closeup the baby's photo orientation is portrait, but in the wideshots when Lucy looks at it and hands it to Ricky the orientation is landscape. (00:01:50)
Answer: There is no reason. It's a just a silly plot device, typical of the era. Women characters were often portrayed as making uninformed assumptions or decisions.
raywest ★