Temporal Changeling

I skipped past the earliest manifestation of Johnny Havig's power in infancy:

his mother, Eleanor, is bathing him;
she hears another baby scream in the bedroom;
carrying the still wet baby in a towel, she goes to investigate;
she sees another naked, wet baby boy in the crib;
surprised, she drops Johnny;
trying to catch him, she grasps only the towel;
Johnny has disappeared;
she searches but does not find him;
later, talking to Robert Anderson in another room, she thinks that the strange baby is still there;
looking in the bedroom, Anderson finds Johnny in the crib;
Eleanor says that he looks and sounds the same but cannot be;
Anderson tells her that she has hallucinated;
the strange baby's hand and foot prints match those on Johnny's birth certificate.

But suppose Eleanor had not been persuaded and had continued to believe that her baby had been exchanged for another?

For my attempt to write fiction about my granddaughter time traveling, see Yossi, the Time Traveller.

Johnny, dropped, defended himself by time traveling while falling, thus causing Eleanor to carry him through and drop him.