Le Pen seems to be alluding to a famous article by Robert Brasillach entitled 'N'oubliez pas les enfants'. He was writing about the rounding up and deportations of Jews, which initially only applied to people above a certain age limit. I remember back in the eighties on Apostrophes, watching an old guy applauding that as evidence for Brasillach's essential humanitarianism and concern for children. Some of the other guests looked like they wanted to show some him some of that humanitarianism themselves.
Le 4 juillet (1942), Laval fait une proposition que Dannecker transmet à Berlin le 6 juillet: "Le président Laval a proposé, lors de la déportation des familles juives de la zone non-occupée, d'y comprendre également les enfants âgés de moins de 16 ans. La question des enfants juifs restant en zone libre ne l'intéresse pas. Je vous demande de prendre une décision d'urgence, par télégramme..." (André Kaspi, Les Juifs pendant l'Occupation).
The round-ups were then quickly organized, in the occupied zone (specially Paris) and the "free" zone, on the basis of children 2 and over. These were often born in France and held French nationality, but their parents did not and all were deported together.