Any deployment advice??

My husband will be deploying for a year in 6 days and my anxiety level is starting to increase greatly. We have a 2.5 year old that is completely a daddy’s girl, and a 4 month old. My husband joined when our oldest was 8 months old, so he left for basic and AIT before she was 1. He missed her first birthday and her first steps. Now he’ll be missing all of our son’s firsts. I’m heartbroken and scared. He does so much for us that I can’t imagine doing it all on my own. Does anyone have any advice on how to make this next year easier?