French cartoons are a great way to immerse your children in French. It will really help them with their pronunciation and after awhile, they should be able to pick up some words or more, depending on their level.
Youtube.com has so many great French cartoons for your little ones to watch. If you type in the search ‘French cartoons’, a lot of different ones pop up. Tom-Tom and Nana is a cute one my kids are watching as I type this. There are also French versions of ones we have here like Pocoyo. Just type in the search the cartoon name in English and then put French, example “Pocoyo French” and you will hopefully find some cartoons that match what you are looking for.