Oh yes, dealt with this with TWO babies, lol. It was difficult for sure. The biggest thing is teaching them to entertain themselves for brief periods of time. Seven months is kind of young, but he can certainly do it for 10-15 minutes at a time so you can complete something and then give him some play time and repeat.
Sharing and splitting work time with your husband is good too, it gives him one on one time with his son which is fabulous, and gives you uninterrupted time to work. It's great if your spouse is supportive, I know some that aren't and it makes it extremely difficult to feel like a good Mom and still do something for yourself. My best friend is going through this, he literally told her he would NOT watch the kids (twins), she would have to work when they are napping or after they are in bed at night, meanwhile she stays home with them while he flys around the world for days at a time for work every week. Can you imagine a father saying he won't watch his own kids? Yea, I wanted to punch him for her.