I went back to work full time when my DD was 5 months old. My DH then took 4 weeks off work. Then my mum looked after her during the day.
It was hellish at first. I used to go into the toilets and cry sometimes. But we needed the money, and I had no option. If I hadn’t gone back, we wouldn’t have been able to pay the mortgage, and we all would’ve been homeless.
The job I went back to was extremely stressful too. I worked in local government and managed a department where our clients were in stressful situations themselves, and if we couldn’t give them what they wanted, some of them took it out on us. On occasion this escalated to physical violence.
It sounds like your situation is different. Your work is clearly not needed to pay for essentials (housing, heating, food). You get to choose whether to do it or not. Lucky you!
To me, 2 days a week is neither here nor there, tbh. And it sounds like it’s something you enjoy doing, since you’ve spent the last 10 years building up your business.
Maybe I’m not the best person to answer this question! I confess that, for me, it comes under “first world problems”.
But it’s serious to you, so a serious answer I shall give. I think you should go back. You might feel bad about letting customers down. If you stay at home you’ll probably be bored stiff within a few months, and have to start again with something new.
2 days a week isn’t much in the grand scheme of things. It’ll be tough at first, of course it will. You’re totally focused right now on your lovely baby (congratulations btw) and it’ll be a wrench.
But what about 5 years from now? Will you regret giving up your business? Will you wonder what might have been? I think you might, in the longer term.
If I were you I’d go back and see how it goes. If it’s too much, you can decide to stop anytime.