You can easily walk to Atlantic Center Mall or whatever they are calling it nowadays and take your offspring to Chuck E. Cheese, if that's their thing. All the baby- and kid-friendly amenities of Park Slope are just a few blocks away.
If you have the chance to get an apartment or house there suitable for your family, grab it! I bitterly regret leaving P.H. Thought I was moving on to better things when I sought to buy instead of rent, and the pursuit of ownership took me out of the neighborhood.
The only possible downside is that some of the schools are not as good as the ones in Park Slope or elsewhere, but I hear that the elementary schools are fine. It's when the kids get to middle school and above that there are issues. I'm sure parents there now with kids in school can and will correct me on this.