any parents with one child regret not having more? or you are at peace with one?

Had 1 more child after 4 years from the 1st as I am FTWM. Now I am SAHM since the birth of my 2nd. To be truthful, it is different. With my 2nd born, I've experienced burnout and feeling overwhelmed and hopeless everytime. But on the other side, I love them to bits. They are my y soul and joy.