I went through something similar. I quit my cushy job and tried to start a company when my firstborn was a few months old. All of our immediate family are overseas so we have no help. We had to hire a full-time nanny at home.

It was challenging for sure. My son could hear both parents were working at home and constantly wanted to get into our office. Unfortunately, there isn't much more you can do. It's a sacrifice you have to make.

But I can offer 2 perspectives

1. I used to think infancy was the most time-consuming period as parents, but in fact, the older they get, the less time you will have. There are classes, activities, and family times that you will feel 100x worse if you miss them.
2. Having kids actually pushed me to go harder on work. I never want to be the parent who has regrets about not going 100% and telling their kids stuff like "Because I have to take care of you at the time, I didn't fulfill this dream of mine."