In a pinch, you can babysit.
Just 1 child... or you will have to get 'licensed' etc.
Do it for a flat monthly or daily rate or per hour.
Also though, it has to be for someone that will be okay not claiming you on their taxes... since you are not licensed/don't have a 'business' license/tax ID number.
And with babysitting, you can still be home with your newborn.
I babysat/did childcare, with my 1st child.
Or, research "telecommuting" jobs in your area... or "freelancing." Or, if you still have connections in your field of your previous jobs... ask someone if they need assistance, that you can do from home... Admin help, scheduling, tracking of data etc. Are you computer literate?
Interior Design, will be client intensive... and you would have to leave the house for on site visits and client meetings. And it is 7 days a week. And the hours for these things can vary. I did Interior Design and have a degree in that too... and I hated it. Its intensive... drawing up blueprints, doing renovations, changing plans all the time, meetings on site per the clients schedules, driving a round a lot, getting building permits, etc. It is not baby friendly if you have an infant at home. Mind you, Interior Design is not the same as "interior decorating." Having a degree in Interior Design... is different from actually having had on the job experience and doing it.