As long as they are fairly moisture free (not in an overly humid environment) and not stored in a hot room (cooler is better) then they should easily last 1 year or so. Keep in mind some of the base malt you buy is probably a year old when you get it. I would think that some roasted malts would store even better.
Best to eat some of that malt first before brewing with it to make sure it has not gone "slack". If it still has a good crunch to it, then you should be good to go.
BTW, I bet you will find some time to squeeze a brew day in once you get used to having the baby around. Your kettle will be calling to you in your dreams.....