This is such a cute picture from the Triptique de la confrerie Saint-Anne a Louvain by Quinten Massys
The little boy has obviously gotten a hold of an adult's bag and is "helpfully" taking all the books and papers out of it. He's got a beautiful book of hours on his lap and is 'studying' a sheet of notes. The embroidery on the bib is gorgeous, and the spiral lacing of his gown that you can see is pretty neat.
You can almost see what's coming next, when the baby decides to see how sweet knowledge is and put some teeth marks on the binding, then nibble the papers.
*Sigh* I'd guess he's about 18-20 months old.