Husband back to work soon

We were lucky in that my husband was able to take 6 weeks off to be home with us with the new baby. He goes back to work the 1st of the year and I’m honestly pretty nervous. I have an 8 year old who is extremely active and the newborn. My husband works 24 hr shifts every 3rd day but sometimes turn to 36 or 48 hr shifts. He helps out so much that I’m nervous to take this on by myself 😳 I was completely a single mom with my first, so I know I can do this, but still!