Releasing all the episodes at once is definitely a good idea for a kids show. Parents can schedule in the show whenever they want, they can use an episode as a reward or push one back as a punishment, they just get maximum control over their kid's entertainment.
For House of Cards, Orange is the New Black, etc. you can make the argument that weekly episodes would be better, but for a kids show I think there is no question that more control is the best strategy.
What benefit do you get by releasing weekly vs. all at once though? I mean, you could argue that you'll have people sign up for a trial to watch a series then drop the service, but that's likely a rounding error for Netflix.
For House of Cards, Orange is the New Black, etc. you can make the argument that weekly episodes would be better, but for a kids show I think there is no question that more control is the best strategy.