While Ritual can get really crowded during the day, they open at 7am and usually pretty quiet until 9am or so. Large open space so enough room for a kid or stroller during that time. And street parking typically available before 9am as well.
I haven't been here with my daughter yet but I love coming here for coffee when I'm in the Mission. So good (I promise I'm not a coffee snob). There's a little outdoor public parklet to sit at on nice days.