Income for stay at home mom

Erin • Mommy of two beautiful daughters. Kenzie, 4 and Leighton, born September 2016.
Hey ladies, 
I have a 4 year old daughter and our second daughter is due in September. I work as a hairstylist now and my daughter goes to daycare. My husband does road construction. I have decided that id like to be a stay at home mom after we have our daughter. My husband is a little leery because of the loss of income (even though he does make good money) 
How do you stay at home moms bring in extra income? Or how do you manage on one income? 
Thanks in advance!