time off after first year????? children

So i am now 7months in. I have learned soooo much already, and i know i have not even touched the tip of the iceberg yet. But i am pregnant=) I will be there almost 13m when i take my maternity leave which is only 6-12 weeks. And realistically when i think about it, if i attempt to go back i will have to have two children in daycare! Which would would mean my whole pay check. I was thinking of taking a little more time like 7m- to a year so that my son can then start kindergarden. Would that be the worse thing to do for my career? I know my floor is hard up on nurses with experience. So I am hoping that my nurse manger will work with me. But not sure to what extent. any adv or experience?