Some popular books on Leonardo da Vinci.
Leonardo da Vinci: Renaissance Man by Alessandro Vezzosi (published by Thames & Hudson in 1997)
,
translated by Alexandra Bonfante-Warren
small book in the middle we find the image below:
Vezzosi writes: Leonardesque images of the embrace of the Infant Christ
and the young St. John the Baptist
are known but none has been found by his hand.