This darling trio of unused vintage French postcards are art reproductions produced by the French National Committee for Childhood (originally founded in 1902 as the League Against Infant mortality). The cardstock is lighter than typical postcards, but while the committee may have skimped on paper, they didn't skimp on the color quality, as you can see! In trying to pinpoint a date for these cards, I came up with circa early 1960s. Note on the faded pink wrapper that the price of the series is not given in francs or euros but listed specifically as 1,20 NF (new franc). Wiki says in the history of the French franc that "a new French Franc was introduced in 1960, due to devaluation in the 1940s and 1950s." So, a little history with your art, and it was all for a good cause!
Each card is about 3.5 by 5.5 inches. A light stain verso on one of the cards but overall, for their age, in almost mint unused condition.