translate English to French: These are the major players, but there are literally hundreds, perhaps thousands, of smaller publishers competing in the children's books market, though their penetration into the distribution channels is undoubtedly limited by their size.
Ce sont les plus importants éditeurs, mais il y a aussi littéralement des centaines, voire des milliers de plus petites maisons d'édition qui se font concurrence sur le marché du livre pour enfants.